You can access this screen by selecting 'Go to - Substance'. Choose a substance and then use the pencil to bring this screen into editing mode. On the 'Linked to' tab, select the 'New' button above the 'Employees' overview to link employees to the current substance.

After opening the screen, you can specify a start and end date for the employee's access to the substance. If you do not provide a start and/or end date, the link is considered 'Active for ever'.

You can then choose an employee from the employee overview. After you have chosen an appropriate employee, click the 'Close' button to exit the screen. The employee becomes visible through the material but is not yet linked. Only after clicking the 'Save' button will the employee be fully linked to the substance.