Honestly, its pretty disappointing that Amazon still doesnt have a native share cart feature. I ran into this exact same headache last year while speccing out a high-density server rack for my brother. I spent hours comparing the throughput on specific RAID controllers and SAS cables, but unfortunately, the session data is strictly server-side and tied to your account UID. The UI is just not as good as expected for a company that basically runs the modern web. Watch out for these pitfalls tho:

• Avoid third-party cart-sharing extensions; I had issues where they mangled the cart metadata and randomly doubled my item quantities.
• Dont share your raw login credentials because of the session persistence and linked payment tokens involved.
• Wish lists are the official path but they often lose the specific third-party seller info you might have vetted for better shipping times. I eventually just had to manually recreate the list on his machine while on a screen share. It was a total nightmare and took forever.

Just found this thread today but I actually have a different take than the first reply. It isnt quite as hopeless as it seems because I went through this exact thing helping my sister pick out PC parts last summer. She needed to pay with her own card but I did all the compatibility research for her. Instead of messing with the wishlist which is honestly clunky for a dozen items, a simple browser extension does the trick. Basically you should look into:

• Share-A-Cart (its a free Chrome and Firefox extension)
• It generates a unique code for your active cart
• Your dad enters that code on his end and everything moves over instantly This saved me so much time when we were dealing with 20 different SKUs for that build. Its way more reliable than trying to sync sessions or rebuilding the list from scratch. Give that a shot before you manually re-add everything.

Re: "Just found this thread today but I actually..." - honestly, after years of setting up home offices for my clients and family, i've learned that the native amazon tools are basically useless for this. if you're looking at a $1,200 haul with monitors and specific cable management kits, you dont want to manually copy-paste every single ASIN. i've tried every workaround and the most reliable way is definitely using a dedicated tool. TL;DR: Use Cart To Link to turn your current cart into a single shareable URL that your dad can open on his end. In my experience, this is the only way to ensure things like those $300 Dell UltraSharp monitors or specific $50 cable trays actually make it into the other persons cart without errors. i used this exact method last month when i specced out a dual-monitor setup for my cousin. you basically just click a button to generate a link and send it over. when he clicks it, everything lands in his cart instantly so he can use his business card for those tax deductions. One practical tip tho: make sure he clears his existing cart before clicking the link. sometimes amazon gets weird and merges the old items with the new ones, which can mess up the business expense total. it saves a ton of time and prevents you from accidentally ordering the wrong vesa mount or the wrong length of displayport cables. definitely worth the 30 seconds it takes to set up.

its seriously annoying how amazon still ignores this basic feature. youd think for a $1,200 order they would make it easy to spend money... unfortunately their native wishlist system is a total mess for bulk office supplies. ive had issues with stuff getting buried or losing the specific variants i picked out because the UI is just not as good as expected for a tech giant. if you want a direct fix, i usually tell people to use Share-A-Cart. its a browser extension that handles the heavy lifting by creating a unique code your dad can just paste on his end. its way more reliable than trying to sync sessions or messing with registries. just be aware that both of you need the extension installed for it to work smoothly. if you dont want to deal with extensions, your only real bet is to move everything to a fresh list and send him the link, but even that is glitchy half the time and sometimes drops items from the bundle.

This ^

Like someone mentioned, it's pretty annoying that we have to find workarounds for this. I remember doing this for my uncle's workshop tools last year. I’m always pretty cautious about installing extensions that want to read my page data, so I spent a night comparing the native Amazon list system against the third-party apps. Honestly, the native lists are just more reliable if you dont want to risk your session data.

• Create a public wishlist and use the Add all to cart button on his end. It keeps everything within Amazon’s own ecosystem which is way safer for a $1,200 buy.
• If you do go the extension route, Share-a-Cart is generally better than the older ones I've tried, but just be careful with the permissions it asks for. Btw, if you're struggling with sharing baskets, Smartphone Board covers a few ways to manage it. Smartphone Board

TL;DR: Everyone is basically suggesting extensions or lists, but none of these options are actually a direct cart-to-cart move. Building on the earlier suggestion, it looks like there isnt a perfect solution here yet. Honestly i have the exact same problem and its been a headache for like three weeks now. Im trying to move a big DIY project list over to a clients account for the billing and i just keep hitting walls. Its so frustrating that we have to talk about things like Share Product or browser plugins just to do something that should be one click. I still havent found a way to make it work and it is such a time sink.