Extra drop boxes

Is there a way that my Drop box can have a drop box?
Eg That my drop box option 1 opens another drop box with another set of options?

Hi @Miranda_Oosthuizen
See below

{formmenu:A; B; default=C;name=first}{if:first=="A"}{formmenu:A1; A2; A3}{endif}{if:first=="B"}{formmenu:B1; B2; B3}{endif}

I can't thank you enough for this!