Tax Year Prior to 2020: I have taxes from a few years prior and had lost my w-2s while moving i acquired my transcripts through the irs. But my ex employers EIN numbers are not complete also should i file all my w-2 together

No, you should not file your W-2's together, they need to be reported separately on your return. Best thing to do is to contact your prior employer and request a copy of your W-2. They should be able to send you that information so you can finish preparing your return. You will need to make sure you have all the W-2's for that year so you can file the return. 

You cannot combine your W-2's together into one. The IRS receives copies of the W-2's as well, so when they process your return they will be comparing that you put on the return to their records and will reject your return if the income does not match what they have.