SUPPORT-NUMBERS is a flag or parameter.
This has three possible settings:
GAP: new support lines will be put in the gap between the
current planned line and the previous line, whatever it is.
PLAN: new support lines will be put immediately after the
previous (lower-numbered) planned line, if there is one
(and as for NIL if there isn't).
NIL (or anything else): new support lines will be put in
whatever seems to be a sensible place.

This flag may well be useless (although non-NIL values
will force it to do the right thing, TPS will probably
do the right thing anyway).
SUPPORT-NUMBERS takes values of type SYMBOL.
It belongs to subjects OUTLINE OTL-VARS .
Its default value is NIL
Its current value is NIL.

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