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To record the contract kindly check the video How to create Employment contract.
https://www.youtube.com/watch?v=IrmF_Ptaf9s&list=PLPEJAgZf2UadMM0LJ-_dQaH-jQM616P6O&index=6&pp=iAQB
When calculating the salary, the reserves will also be calculated.
Kindly fill the document Payroll calculations.
This tab is populated with data on the benefit amounts that will be added in this pay period to the amounts accrued in previous periods
for the employees of the selected department and its subdivisions. Only the employees with benefits in the specified currency that
were assigned in the employment contracts and contract changes will appear in the list.
The tab is populated along with other tabs once you clicked the Fill button on the toolbar. Calculation of benefits is performed each pay
period simultaneously with payroll calculation once you click Calculate on the toolbar; however, accrued amounts are not paid to
employees each pay period.
See also: 10.3.1. Payroll Calculations
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See also 10.3.2. Payroll Sheets (There you will get acquainted with the documents that list employees with their net salary for their
work during a certain period of payment (registration) or with the payment of sick leave, vacations, benefits or final payment after dismissal.)
You can get more detailed information in the report Statement of Employee Benefit Provisions.
This report provides summary information on accrued amounts of employee benefits. 
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