You have 3 W2 forms? You have to enter all of them on the same 1040 tax return. If you didn't enter some on the first 1040 you filed then you have to file an amended 1040X to add the other ones. If you try to efile another regular 1040 it will reject.
How much is the refund on 1040 line 35a? You don't always get back all the withholding in W2 box 2.
How to Amend the current year to change or add more income
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-federal-tax-return-curr...
