Wherever you want your dropdown of names to be placed, select that cell (or range of cells), and select Ribbon>Data>Data Validation>Allow List>In the Source Box enter:
and select Okay. This will enable a dropdown list for your employees, and will dynamically change as you add/remove employees. As for your other requests about adding a Services dropdown and incorporating a gross/net/profit result (on the the Billing form), that was already shown in a previous workbook I had uploaded for you, but if you need more help just let me know.
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