[amibroker] Multi-category Composite (New to AB)

["whitneybroach" <WhitneyBroach@xxxxxxxxx>]

New to AB, QuotesPlus subscriber, have been using WealthLab for years
(and its IndexLab more recently) and am now starting the AB learning
curve.  Looking forward to it; this looks like a great product and
community.  Computer science major from 20 years ago (my C is rust
encrusted), all recent coding experience in WL's Pascal subset.

I need to learn to fish.  Which AB features, AFL
functions, prior posts in this group and other documentation elements,
should I be looking at for the following index/composite need?

Suppose I want to maintain an index -- maybe new 52-week highs -- only
on tickers that appear in multiple categories.  For example, a Nasdaq
Common AD line that includes Nasdaq but does not include NYSE or Amex
symbols.

Because of the way AB imports the QuotesPlus data, the AB database is
set so that each exchange has its own category and "Common" is a
category.  So if I wanted an "all-common" composite I could just scan
Common; if I wanted an all-Nasdaq composite I could scan "Nasdaq"
under Markets.  But what if I want only Nasdaq common stocks?

Of course the desire is to automate the daily maintenance.  The
QuotesPlus daily download is running through WinXP Scheduled Tasks
already; works fine.  QP Scans to produce exactly the require
universes (.lst's) every day are also working to support WL's
IndexLab; maybe that's part of the answer for AB as well.

Best regards,
Whitney