Have you seen the Leave Request PowerApps sample template?
The Leave Request PowerApps sample includes the following functionality:
– Employees can create leave requests and submit to their managers.
– Managers can easily administer leave requests in a unified view.
– Easily track leave status, prominent company holidays and leave balance
You can get it here: aka.ms/leaverequest.
Here are several videos that will get you up and running and teach you more about the Leave Request PowerApps sample.
Using Excel as the data source for PowerApps
Filtering and sorting galleries in PowerApps