Another workaround: Copy and Paste the PartBody so you have two shapes (bodies) of your part. Split first one with arrow up, and Split the copy with the arrow down.
Another workaround: Copy and Paste the PartBody so you have two shapes (bodies) of your part. Split first one with arrow up, and Split the copy with the arrow down.
Copy the PartBody and use Paste Special + Result With Link. Do this twice so you have two copied Bodies. Then Hide the PartBody, and Split the pasted bodies. Any changes made to the PartBody, will update in the copied/linked Bodies.
If you don't want the extra hidden body in your file.
You could take your unwanted shape and paste special as result with link. So now you have two of the unwanted shapes.
Create 2 new bodies.
Do a boolean add of one of your unwanted shapes to one of the new bodies.
Do another boolean add of the other unwanted shape to the other new body.
Now you can do a split in each of the new bodies after the boolean operation.
One body will have the parametric history with a split afterwards. And the other will have a linked body with a split afterwards.