I use milled lumber so it is not the same thickness for most projects I do. Is there an easy was to change the depth of cut in gsender instead of always changing it in Vcarve then saving it?
Sure. Once you get your XYZ zeroes done, jog your bit where there is room off part below your Z zero. (Because you may be zeroing to the machine surface. )
Click go to Z zero.
Now use the Z jog to raise or lower your bit the amount you need.
Click zero-Z, and your ready to cut.
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Amazing! Will try tonight ty
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Sometimes when I work with ‘nominal’ lumber, which is all the time 
I make the first toolpath a pocket over the whole project area that brings it down to the minimum expected thickness.
For example, and I work in mm by the way but often get lumber in Imperial, if I have some 3/4"x whatever and it varies from 17-21mm (19±2) then I set the project thickness to 21mm and pocket 4mm. Then any v-varve etc starts at 4mm.
The problem you’ll run into when doing it this way is how to set the Z now that I made my project 21mm and my board is maybe 18mm? You set the bit to just touching the spoilboard and enter -21mm (the minus being super important here) in gSender. This gives you a zero at 21mm above the spoil board. Then your pocket toolpath will cut a couple of mm of air and then the wood to 17mm thick and leave a good surface for starting a v-carve or other work. And your multiples if doing them will be the same thickness.
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Welcome to the world mom2zg 
.
I do what Michael does on every project. It saves my spoilboard and after surfacing, all of my projects turn out great, except for the occasional mistake in my designs.
This makes sense but having a little trouble with order
Zero xyz
Move z to just below material thickness then hit go to z
(When I do this the bit moves to the z I just zeroed)
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The point of the operation is to change your depth of cut to different depth of cut than what was set by doing the normal XYZ zero functions. (perhaps e.g. go to a corner of the stock; zero X; zero Y. Go to the top of the stock or top of the wasteboard; zero Z.) So you’ve determined that cutting (from your Vcarve file) with Z based at that zero level will not be adequate (due to milled lumber etc.)
So, my proposal is to move your machine’s Z to a position (that you have just set) where you can then make your Z adjustment to the desired level; in other words, go to Z. However, jog to an XY position where the bit won’t contact the stock or wasteboard.
Then, hit the GoTo Z button which moves the bit to the Z position (that you have just set).
Now, make your Z adjustment to the desired level (+/- or type.)
Now, hit the ZeroZ button to set that new position into Z.
Don’t forget to jog Z up afterwards to clear obstacles. GoTo XY will bring you back to start the cut with a Z that’s adjusted to the desired level.
It takes much longer to spell this out than to do it, and I created a macro make this exact adjustment for my Z change of +0.010" because I use two layers of blue tape with CA glue under my stock to hold it down.
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This thread got me to thinking about my macro to correct Z for the blue tape CA glue thickness beneath my parts, because I’m starting to regularly use different workspaces for projects with fixtures.
So, I’m testing some changes to several macros that I use in my work flow.
I’ll post at least one of them here as soon as I get through testing it in the real world. 
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Well, in case you couldn’t sleep and were just sitting on the edge of your seat waiting for me to post some kind of macro thingy, I have now posted.
Only thing is it isn’t here its over here …