My suggestion is to add to the Vendor master (Vendor> All Vendors> Selected vendor> Tax 1099) a box for the User to enter the default State and State tax ID. This information would transfer to the transactions as would the 1099 box. Currently this a purely manual and time consuming effort, which is prone to errors as the option to enter multiple State tax IDs exists and there is no way of setting the default.

With the creation of the new 1099-NEC reporting requirements from the IRS, they have stated that the new 1099-NEC form would not be incluided in the Combined Federal/State Program which electronically forwards information returns to participating states. (See IRS publication 1220, Section 12 - https://www.irs.gov/pub/irs-pdf/p1220.pdf). This will require Users to enter the State tax ID on the Vendor's master record. HOWEVER, this information is not transferred to transactions, that must be done manually or using the Update 1099 process.