I have multiple 1099, how do i enter this in turbo tax

After entering the first Form 1099 you have to option to "add another Form 1099".

 

For example for Form 1099-R:

 

1. Login to your TurboTax Account 
2. Click on "Search" on the top right and type “1099-R” 
3. Click on “Jump to 1099-R”
4. Enter your first Form 1099-R
5.  Continue until you see the “Review your 1099-R info​​​​​​​” screen
6. Click on "Add another 1099-R"

 

If this doesn't answer your question then please provide more details on what Form 1099 you are trying to add.