Sample in attachment.
Do you mean, you want to subtract that arrow shape from circle?
If yes, then you will need to import PNG file of the same. You can not Add or subtract shape in SL. :)
Yes, add/subtract capabilities in SL would be awesome. Currently I pull something like this into PPT, do the add/subtract, and save it back out as an image from PPT that I can use in SL.
You could submit a feature request here to have this feature added to SL - http://www.articulate.com/support/contact/submit.php?form=feature
Thanks)) I'll submit feature!
Thanks for your assistance, Brian and Parashuram, and for submitting a feature request, Dmitry! :)