Hi @LuisB,
You could do the same as outlined in the image below:
In the survey tab of your xlsform:
In the choices tab of your xlsform:
Data entry screen as seen in Enketo: (when the percentage exceeds 100)
Data entry screen as seen in Enketo: (when the percentage does not exceed 100)
Reference xlsform:
Cumulative Percentage 100.xlsx (11.6 KB)