Assuming that you are filing as Married Filing Jointly, you'll enter those estimated tax payments under the Personal tab, under "Deductions and Credits". See the instructions in the TurboTax FAQ below.
https://ttlc.intuit.com/replies/3300049
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***