I have heard a request from a customer to add a new form in GP which is developed from Dexterity. For this case, if we created a new forms/windows in dexterity, then we need to add this new forms/windows to either any modules menu list with using dexterity coding or add it manually in GP home page navigation list.
To add you new form/window to GP menu list use the dexterity code which is located in Dex.chm.
To add your new form/window to GP home page navigation list, follow below steps.
1. Go to GP home page then right click from the left side of your dynamics GP home.
2. Select Add–>New window.
3. Then select your new from the product which you have created from the chunk file.
4. Click Add and Done to add your new form/window to GP home page navigation list area.
Hope this helps!!!