how to select solid to edit it

I'm new to TCL scripting, and I'm looking for a way to select a solid by its location.  I looked into *createmark with the 'by box'/'by cylinder' option, but they don't work for solids. 

 

'This is currently supported for nodes, elements, connectors, components (FE and connectors only), loads, equations, loadcols, systems, systcols, vectors, vectorcols, blocks, groups, sets and contactsurfs' - from Altair 14.0 documentation

 

I would also use the same method to find surfaces to edit solids. 

 

Can somebody help with this?