Extruding an area
Hi, can I pull out or extrude the neck area in ZBrush or is this not a good idea?
Please tell me how (which tools) to use to do this?
Saving Files
Oh and another question. If I have a ZTool saved then why do I need a .zbr file? Don’t you just need the .ztl. I tried opening the .zbr file before but when it opened in ZBrush I pressed “T” and it wouldn’t let me edit it so what’s it good for?
Thanks 
You actually have a few options you could do…
If you have GO Z, just press the button and go back to MAYA or whatever and extrude and then press again and your mesh in zbrush will update nicely with the new geometry.
Just pull it out and let the polys stretch. Put it in the basic shape you want and then retopologize a new mesh over the whole thing and transfer your details to the new mesh. There are a ton of tutorials on this and it’s covered pretty well in some books.
Attach a neck piece .obj to to it and then retopologize a new mesh over it.
Probably a million more ways to do it too… Those are just the three I can think of.