But don't ever call them $$ "withheld", just say they were quarterly estimated payments.
The terms "withheld" or "withholding" are specifically reserved for $$ actually retained when certain funds are distributed, and already reported on various tax forms you may have entered.
...like box 2 on a W-2 is Federal "withholding"
....box 17 on a W-2 is State 'withholding'
...Federal taxes "withheld" when retirement $$ are distributed are in box 4 of the 1099-R.
etc..etc