Here is how to add the "Selling" tab for a user via FocalPoint administrator;
Go to Security Profiles
Highlight the profile the user is under
Click Edit
Click on the Security tab
Highlight Forms
On the right, Highlight Sales Invoices and click Enable.
The user will also need usage rights, to do this, do the following;
Go to System options
Go to Sales & Billing
Go to Sales Invoices Setup
Highlight the relevant Sales Invoice and click Usage at the bottom.
Scroll down to the user's ID and tick the relevant boxes to the right of it.
The user will now have the Selling tab show up within their FocalPoint Application.