IS it possible to say Manually jog the machine to some point. set ZERO for the X & Y (for non delta users) . And then the machine starts from their. without respect to any previous settings or limits... thinking this is the center of the part.
-S
Looking at the subjects of all of your posts on the forum, I get the idea that you're not wanting to use the software to drive the printing of 3D parts, but of possibly something like a CNC milling machine. And to answer your question.....it is probably possible to manually move the "head" to a starting point and then start a process running.
To do this, you will need to have in-depth knowledge of gcode, the hardware you are using, and the way in which 3D slicing works. You'd then need to re-write the start and end gcode routines completely, ensuring any steps necessary for your hardware are run....and then there's the small point of ensuring you don't cause any interference between machine parts and anything that might be in the way.
If my guess is wrong....and you are actually wanting to 3D print, and are looking at an alternate way to print more than one part at the same time without printing each part's layer 1, layer 2, etc., then if the parts you are wanting to print are VERY low profile....and will fit in the clearance between bed and print head/chassis, etc, then yes, there is a way to do this. Arrange all the parts on the bed in the GUI, give each a separate print profile (which can be duplicates) so that each part has its own print profile, and use the Sequential printing option that is on the Select Processes for Preperation window that will appear when you hit the Prepare to Print button. You'll also need to input a value for Max height clearance....which is the fail-safe to stop the printer colliding with any printed parts. If you're printing multiple parts that are greater than the clearance, then the software will print a number of layers for each part, then another number of layers..and so on.