macro for exporting as step from assembly

Dear colleagues
I need a macro which saves given assembly and its children objects as a separate .step files. For example from the tree in attached picture i have to extract five step files - assy1, part1, assy2, part2 and part3.

Can it be made to add the part/assembly revision letter added after the name ? OK, i can read em all from SWexplorer and add em manually but still...

p.s. I tried some macros from this forum, but haven't found similar yet...

thanx in advance and kind regards