Conical Interpolation programming on Fanuc's

Hello -

We have a horizontal machining center with a Fanuc 31i control and I need to do some Conical Interpolation (to mill a tapered bore). I'm not sure how to write the line of code to do this, can someone give me an example line? I can do this on a Mazak with a G02.1 or G03.1, but can't get it to work on the Fanuc, I've tried a few different ways.

Thanks.