yes if you had $7000 as the carryover from Line 14 on last year's 8606 that will carry forward to this year on Line 2 of 8606, added to whatever you contributed this year on Line 1.
But... why did you have a basis carryover, what is the situation with your IRA on 2024 filing... did you just make a non-deduction contribution in 2024 hence the $7000 basis that year? But you didn't convert it to Roth? Do you have an outstanding balance in your IRA as of 12/31/25? Do you still have a $7000 basis carry over to 2026 on Line 14 of your 2025 8606?
If you put $7000 into the IRA in 2024 but didn't convert then I'd expect you to (hopefully) have some earnings in the IRA and if that's the case then these Roth conversions will be throwing out some tax as they would be partially taken from the earnings.
If you did a backdoor in 2024 with the Roth conversion and didn't have any balance coming into 2025 then you may not have filed it correctly hence the basis carryover (and maybe you paid tax you shouldn't), if so you may need to amend your 2024 return.
