Jimmy,
Assuming the following:
1. That your billing address is in a textbox called, let's say,
txtBillingAddress.
2. That your shipping address is in a textbox called txtShippingAddress.
3. That the checkbox is called chkUseBillingAddress.
Add the following to the checkbox's AfterUpdate event:
Private Sub chkUseBillingAddress_AfterUpdate()
If Me.chkUseBillingAddress = True Then
Me.txtShippingAddress = Me.txtBillingAddress
Else
Me.txtShippingAddress = ""
End If
End Sub
When the checkbox is ticked, txtShippingAddress will contain the address
found in txtBillingAddress. When the checkbox is cleared, so will
txtShippingAddress.
Regards,
Graham R Seach
Microsoft Access MVP
Sydney, Australia