My stock losses were around 30k dollars one year. Does turbotax carryover the losses automatically from year to year for 10 years ?

Yes forever how long it takes to use it up.   You get to first offset the loss against any gains you have each year so that can use more of it up.  Then after applying the loss to the current gains you can take a max loss of 3,000 (1,500 MFS)per year.  Turbo Tax does all the calculations for you.  Just enter the prior year carryover amount.

If you transferred your prior return it should be already filled in.

Q. Does TurboTax (TT) carryover the losses automatically from year to year?

A.  Yes.  But, as others advised, you need to verify.

TT will prepare a capital loss carry forward work sheet for the current year. When that transfers to the next year's return,  it will show on the capital loss carryover work sheet, and go on Schedule D.