System allows creating payment types for the accounting purpose.
Add Expense Payment Type
Click on

icon to add new Expense Payment Type
and fill in data as required
Edit Expense Payment Type
Click on

icon against the item to edit existing Expense Payment Type and fill in data as required
Delete Expense Payment Type
Click on
icon against the item to delete Expense Payment Type

System will not allow deleting the Period if it is currently is use or has been used in past.