Pardon my vague descriptions in the detailed use of AutoCAD, but I would hope you have enough experience with it to proceed with this explanation.
This is the way I do this. It may not be absolutely correct or the shortest process, but it does what you are asking. There are other programs that may take your artwork from raster or vector imaging direct to G-code, but AutocadLT does not have this option. You will have to do the Geometry overlay manually.
Have the Acad and Paint programs open. Paint should have your artwork open in it and Acad does not need anything open as it defaults to Drawing1. Use Save As to rename the current DWG to suit.
In Paint you can use the Edit drop down on the toolbar to Select All then use Copy. You can use cut and paste as well if only a section is needed.
Now go to Acad and use its Edit drop down menu and then use Paste to place your artwork into Acad. It is possible to just right click the mouse and paste it form that menu also.
I then set up a Layer that I can do overlay work in Red lines to create pure geometry on top of what ever artwork I choose to duplicate.
You can turn off the Layer that has the artwork to make it clearer in details as you draw. Save your work every so often. Using construction lines will allow you to copy all of your geometry to another location in the DWG for different revisions or enhancements, etc, etc, what have you. Replace it over the artwork to double check things if need be.
Once you are satisfied with the results, save your work as a DWG and then as DXFor DXFOUT command for gaining the transfer file used with BobCad to create your G-code.
Here is a link to one of my previous post attachments to show an example. AutoCad overlay
One way is all it takes. Your experience may find some shortcuts I know nothing about. [img]/ubb/images/graemlins/smile.gif"%20alt="[/img]