Lines 1a-1f are only for Turbo Tax to help you enter the income. Only the total on 1g goes to Schedule C line 1. And actually 1b is for 1099NEC and 1a is for gross receipts not reported on a 1099NEC. Are you using the Online version or the Desktop installed program?
As long as the total income on Schedule C is the same or more than all the 1099NEC forms it's ok. Yes if you delete the second Schedule C you will need to add the amount to the other schedule C.
