I have a taxable grant in box 6 on a 1099-G. Due to covid relief. Where do I put it? Box 2,7,9 are the only ones available.

Please see this answer from PaulaM.

You can enter it under your Business income in Other Income. Then enter a description 'SBIR Grant reported on 1099-G' and the amount.

The amount will flow to line 6 of your schedule C and be included in gross income and net income will then flow to the schedule SE.