Add these links in your existing admin left menu under HRMS / Payroll:

<li><a href="/admin/hrms/phase3_dashboard.php">Payroll Dashboard</a></li>
<li><a href="/admin/hrms/salary_components.php">Salary Components</a></li>
<li><a href="/admin/hrms/staff_salary_structure.php">Staff Salary Structure</a></li>
<li><a href="/admin/hrms/salary_process.php">Process Salary</a></li>
<li><a href="/admin/hrms/salary_sheet.php">Salary Sheet</a></li>
<li><a href="/admin/hrms/salary_hold.php">Hold Salary</a></li>
<li><a href="/admin/hrms/loan_management.php">Loan Management</a></li>
<li><a href="/admin/hrms/bank_export.php">Bank Export</a></li>

Add this link in staff portal menu:

<li><a href="/staff/hrms/salary_slips.php">My Salary Slips</a></li>