as per the thread i started quereying presentation of a 3d document (for details in 3d) it would be good if multiple cutting planes could be adjusted based on each individual element to achieve the images as shown in the linked thread:
this way you could adjust the lengths or cut positions of each element individually inside a 3d document without affecting the live model.
when you create a 3d document the cut position is set to cut all elements at the same position by default, you could then select individual elements cut face and udjust their unique cutting point depth either in or out, with the additional option of switching the cutting plane perpendicular for other elements (such as a joist running perpendicular) as required.
These 3D details could be saved and included in the bimx document and and changes made to the live model would be shown and updated in the detail.
it would save time having to remodel the portion of the building you are trying to detail, and any changes would be updated without having to change the 3d detail model over again.