@hawaiiarchitect ,
Gear > Custom form styles
Click on New Style (upper right)
Select Estimate from pulldown
Replace "My ESTIMATE Template" with "Proposal Template" (or your choice of new form title)
Click on Content (second tab of gray bar, upper left)
Click on small pencil icon in top section of form (far right)
Editable fields will appear on left side of screen
Scroll down to Form section, Form names
Estimate has an editable box next to it, type in Proposal
Click Done (bottom right)
List appears with new Proposal Template and Standard
Set the new Proposal Template as default, using the pulldown under Action (far right)