You would not be able to create a new tab but simple "hide" the information by turning it into a read only display
If you click on any given parameter or tab in the "Form Editor" you'll notice the options that come up at the bottom.
Find the one that says "Enabling Parameter Name," this turns the parameter or tab into a read-only scenario based on a True / False paramter
I would create an extra True / False parameter and have it changed based on the selection of your radio button
Example:
If /Your parameter name here/ = "2 - 4 Leg Pipe Gusset" Then
4_Leg_Pipe_Gusset_Button = True
Else
4_Leg_Pipe_Gusset_Button = False
End If
