You can simply create a Assembly sketch and use extrude cut, if you turn the visibility of the parts you don't want cut off before extruding they will automatically be excluded from the extrude and you just have to toggle there visibility back on afterwards .
Video showing how to do the extrude
You can also add participants to the extrude which I showed in the video after the fact but I didn't show how to remove them from the extrude, basically you can right click on them and select "Remove participant" as per the below image

You could manually change the parts option from participating in the section and then do a "Three Quarter Section View" but this would take more effort and you can simply suppress the extrude when you want the assembly to go back to its normal state.
If this solves your issue please mark this posting with the "ACCEPT SOLUTION".
If you like something that was said or if it was helpful, Likes are appreciated. Thanks!