What is the process for bulk removal of an element from specific employees, or for assigning the element for a limited period?

From  the Payroll Module :

• Navigate to Submodule  “Salary initial Data”
• Go to "Unassign Salary Elements"
• Select the element type and the employees 
• Click “Save” to complete the process
• OR An element can be assigned for a specific period by:
• Navigate to Submodule  “Salary initial Data”
• Go to "Upload Salary Elements and Payroll Data "
• Select “Upload Employees Salary Elements Sheet”
• Select Salary Elemet Type “Earnings”
• Select "Download Template" 
• Complete the required fields in the template “start date and end date”
• Reupload the completed template to the system
• Select the relevant “Salary Element Name ”
• Select “submit" to finalize the process