[PvK]

(Wow, simultaneous post!) Yes, Aiken gave a good example of what I was saying. Be sure that later entries will need to have a greater number than earlier entries of the same basic type, so if you want X small bases and Y large bases, it would read:

Entry M Type := Base Space Yard
Entry M Planet Per Item := ?? (your choice)
Entry M Must Have At Least := X
Entry N Type := Large Base Space Yard
Entry N Planet Per Item := ?? (your choice)
Entry N Must Have At Least := X+Y

(Where you do the addition and put the resulting number in place of X or X+Y.)

PvK