I finally found a way! 
Here’s what I did:
1- Created a New Table Named - Temp - with 2 columns
2- On Escala Table - Created a Template Column with “addrow”
3- On Escala Table - Created a Relation with “addrow” and Temp table
4- On Repertório Table - Created a Single Value Column pointing to Temp Table and a Lookup column to retrieve Date
5- On Show Detail Screen - Created an Action: Set Column Values where I put the current Show data on Temp Table ==> Action - Show New Screen with Repertório Table
6- On Repertório New Screen > Inline list > Action - Add Row
Hope this process can help someone! 
And @Jeff_Hager Thanks for your alternative solution.