The workflow from Aspire Carbide Motion is pretty simple, Create your toolpath in Aspire, save the gcode file, then open the Gcode file in Carbide Motion. Very straightforward. There is a Shapeoko/grbl specific post processor.
If you’re using the Bitsetter (another great tool) in your workflow @neilferreri has done some awesome work and created a Post processor for Vcarve (which works in Aspire) that will let you save all toolpaths for different tools to one file, and it will just prompt you to insert the next tool then use the bitsetter to check the new tool length, then carry on - Here