If you're talking about moving individual pieces, yes, there is a wonderful function. It's at the bottom of the screen on the toolbar below the view window. There are a few drop down menus. You're going to want to click on the tiny grey circle that's titled "proportionally editing" when you pull up the menu. Select the tiny blue donut that says "connected". You can now pull individual mesh pieces any which way by selecting one or multiple vertices or faces or edges. To make the pulling radius smaller you just click and hold while you scroll in and out with the center mouse wheely dealy. It may take a lot of scrolling in at first to get the radius small enough to work with. This will allow you to mould the mesh A LOT easier. One more tip when using blender: When you export, you're going to want to select the mesh you're replacing then go to export-->object. In the bottom right hand of the screen there will be a list of export settings. ONLY select "Selection Only, Apply Modifiers, Write Normals, Include UVs, and Objects as OBJ Objects". Everything else should BE un-selected. Don't ask me why, but I did a long and painful trial and error of this to get it to work and these settings did the trick. Happy modding!