You'll have to go into your nc editor in Bobcad, and open up the setup, and then conversion. This will be where you enter a generic version of what Bobcad posts in the left hand window, and then the conversion should be put in the right window.
The conversion amounts to simply dropping the Z and K words from the G02/G03
There are special codes that you use and I think it tells you somewhat about this in the help file. For example, to remove all instances of K, you would use this in the "Original" window:
And on the same line directly across from this in the "Convert to" window, you simply leave a blank.
The basic idea is that you will likely never have need to use a Z nor a K value in your G02/G03 lines, so you remove them in this fashion.
Check the Bobcad website for more info and help.