-- track securities by brokerage firm

AND

-- track ownership (husband, wife, joint)

Is this possible?

The possibilities are endless. Here's one way to do it. Have the first two digits of your qualifier signify the brokerage firm. Let's say you have 2 firms, Morgan Stanley Dean Witter and Salomon Smith Barney . Every one of your investment accounts would have one of the following qualifiers:

/MS for Morgan Stanley Dean Witter
/SB for Salomon Smith Barney

Then say you want to track ownership. That can be the third digit of your qualifier. Every investment would have a third digit as follows:

/xxH for husband
/xxW for wife
/xxJ for joint

Thus, the husband's investments at MSDW would have the following qualifier:
/MSH

The couple's joint investments at MSDW would have the following qualifier:
/MSJ

The wife's investments at SSB would have the following qualifier:
/SBW

That's just one example. If you want to use more or fewer digits for each item, fine -- with one important rule. You MUST use the same number of digits consistently. Don't use MSDW and SSB, for example. Make it MSDW and SSBA, or something else of equal length.

Maybe combining the two looks weird to you. You can insert a dash in there as long as you do it consistently. For example,
/MSDW-H
/MSDW-W
/SSBA-J

While you can use a dash (i.e. the - character) DO NOT use a slash (i.e. the / character) within your qualifier. One / per account name please!

IMPORTANT
You'll need to design your qualifiers carefully and consistently for this to work.