Hi everyone I'm sure you have all been through this: I'm used to drawing in m, I have a new project and drawings (to use as Xref) come in cm. I know how to scale a drawing to what I want, so I can start designing in cm.  Problem comes with the dimensions, when I incorporate the dims i usually use they don't work (they are set to m) Is there a way to change the dimensions to what I need? I've tried to change the scale factor 100 but it doesn't do anything. Any help would be much appreciated I don't want to have to draw all the dimensions from scratch.I'm posting two images first is my drawing in M second in cmdrawing in cm:drawing in m:

You're doing all of this in model space aren't you?  Are the dimensions annotative?
John Connor2015-10-01 11:32:39

yes, model space. what do you mean by dimensions being annotative?

Forget about annotative.So you created a new dimstyle, clicked on the Modify button, then clicked on the Primary Units tab and where it says Measurement Scale > Scale Factor you set this to 100.  Is that correct?  If you did then a dimension of 1 unit  would now read 100 units wouldn't it?  But you say it did not work.  That would only happen if you did NOT set the new dimstyle as Current.