Add two new forms (frmSale, frmPayment) like:
Design mdiMain like the picture:
Add this code on the "Form_Load":
''Allows
mnuSales.Visible = frmLogin.Sales
btnSales.Visible = frmLogin.Sales
mnuReporting.Visible = frmLogin.Reporting
mnuManagement.Visible = frmLogin.Management
mnuCatalog.Visible = frmLogin.Catalog
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