In this case, you could simply skip a group if a condition is met as shown 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 a condition is not met
Data entry screen as seen in Enketo: when a condition is met
Reference xlsform:
Selecting an Eligible Respondent.xlsx (11.3 KB)