Hi Andy.Man,
Sorry for the delay, I checked early but since I have gotten no e-mail notification.
The pre-defualt selections are C1 C2 R1 and R2
One per Selection field and always capitals, not small letters.
It is available in several objects, e.g., Extrude or Sweep.
The most right positioned Texture tag will be on top. So in order to see the C1, C2, R1 and R2, the overall material (or main body material) needs to be left in the Object manager.
All the best
Manual:
Apply a material to the start cap by using the Selection box (Texture tag). For example, type in C1 to apply the material to the start cap (use a capital C). The options are:
C1 = Start Cap (Cap 1)
C2 = End Cap (Cap 2)
R1 = Start Rounding (Rounding 1)
R2 = End Rounding (Rounding 2)