Hello there peeps… ive been modelling this super soldier for a while now… the premise is that he’s a cyborg…(typical)… he has a mechanical right arm and wires and stuff coming from him… but I have this issue… I started off with a box mesh I created in maya… and obj’d it into zbrush to begin sculpting… no problems… the issue arises when I import all other details, such as the arm, the visor, his armour. They import into zbrush at a really small scale compared to the model. Where as when they were modelled in maya, they were modelled to scale to a draft copy of the model… so the sizes should match up…so… i’ve been scratching my head as to what the problem is?? I then thought to import the appendages using subtool master when i import the original box mesh of the character… it worked no problem… but when i came to creating a few mre aspects of his mechanics in Maya, and then import them into zbrush…again, they were ridiculously smaller… It seems to happen if I hide select a certain area… say the head for instance to work on… it seems to completely mess up the symmetry…I’ve tried to set the pivot point…clear the pivot point… ive tried unifying the geometry… to no avail… all i do know is that in the preview window… the model of the soldier is huge… but can’t seem to get it to reset… has anybody any ideas??? Please help as im sick of banging my head against the monitor… plus I have to write a dissertation on this bad by as well…all advice woould be gratefully recieved… cheers!! 
My first recommendation would be to scrap anything you currently have in ZBrush and import from scratch. This time, though, use the multi-import feature found in SubTool Master, which is in your Zplugin palette. This will let you import all the model’s OBJ’s at once, creating a single tool with multiple SubTools. They should all be appropriately scaled at that point.
If they aren’t, then the problem most likely lies somewhere in the export settings from your other app.
cheers mate… yeah… that works… i’m definatley gonna remember that…been scratching my head for like 5 hours now!! 
something funky is going on with symmetry and i’m in need of help fixing it.
I went to try out the radial setting on a plane.
i set up the tool fine, i think. i forget how to make the plane double-sided.
when i turn on symmetry, the drawing points are vertical, although i selected x symmetry. and when i attempted to draw, after turning radial symmetry on i could not see anything happening, though yes i was in edit and draw mode…
i loaded a cube and turned on x symmetry without the radial turned on. the cursor still shows vertical as if i had y symmetry turned on.
any clues into what i’m doing wrong, would be most helpful…
lawd, is there a newbie forum here?