You can reimburse approved expenses into the Payroll Module by mapping each category to the respective pay element on Payroll.
NOTE: Please make sure the pay elements you want to use are already created on the Payroll Module and before doing a first claim it has been mapped.
Step 1: On the Categories page, put a tick into the option: Transfer to Payroll
Step 2: After, please click on the 
icon under the action column
Step 3: A pop-up window will appear, please choose the pay element that you want to map along with the category on Expense
Step 4: After, click on 
to save your choices. Kindly repeat steps 2-4 for each category in your system.
Next step: Reimburse Expense
Final step: Process Expense via Payroll