Are you an Iowa resident? How, exactly, did hundreds of sales get transferred from your federal return to your Iowa return?

Texas resident.  I have a Schwab ETF "Intelligent Fund" that makes numerous ETF sales /purchases. Each one of these transferred to the Iowa return individually in addition to capital gains/losses from my K-1's. I went to Forms and just marked them all as exclude.  Fastest way.  I did 14 other state returns primarily for LLC partnerships and didn't have thus happen 

another approach :

e-File Federal only. Print a copy for your records.

Then go in and delete the imported transactions.

Review your Iowa state return, the capital gains/losses should be gone.

If not, delete the Iowa return and redo it.