Measure Combined Volume

Hi,

I have a number of simple shapes, generally boxes of differing sizes. Is there a way to measure the volume of more than one element at a time? I.e. I'd like to click on one element then hold the control button and click another element [+n] and for microstation to tell me what the area of both elements [or +n elements] combined are.

Is there a way to do this already? The nearest I can get is to physically merge all the shapes together then calculate the volume, but it would be less time consuming if I didn't have to merge the elements first.