Can vendors be assigned particular chart of accounts expenses as we were able to in the desktop version of QB Pro?

The question asked was if you can assign a preferred Expense Account / Chart of Account code to each vendor, not assigning Preferred Vendors to Items. There is a difference. 

Assigning a preferred Expense Account / CoA account to a vendor lets you see which Account you typically assign that Vendor. This option is available on Desktop - by assigning preferred Expense Accounts, that makes the Expense Account automatically prefill when entering a bill. This helps in several areas.. one example is when a person doesn't remember (or know) exactly which Account to assign when entering a bill. It eliminates some guesswork, and also the need to go back and look at how previous bills were entered for that vendor. While the Recurring Template and the Prefill with Previous Content options are available and might help a couple of people when entering bills, not everyone wants to blanket apply those extreme options across every Vendor. Maybe that would work if only certain Vendors could be selected to Prefill with Previous Content and we could choose exactly which content we wanted to prefill. But nobody wants to have to spend as much time removing unnecessary info from a bill prefilled with all previous content as it would be to just enter it from scratch. And if we wanted to just copy a previous bill, we can already Copy a Bill. We just need the simple option to assign an Expense Account to Vendors.

What you suggested was assigning a preferred vendor for an Item.. this lets you see which vendor you typically purchase that item from, like on an Item Listing report. So if you need to order new Inventory, for instance, you can go to that Item you need and find out who you need to contact to order it. This isn't what we're asking.