On Land

Environment Information
At Rill & Decker Architects we run ArchiCAD on Mac OS X. If you work at Rill & Decker, this is your stuff. If you don't, but you work in ArchiCAD, you may find something interesting. Anybody else, I don't know.
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You can't place a detail marker in a detail window. Rats.

You can change the linked drawing of a placed marker by opening the settings and clicking 'Browse' underneath the detail name.

I've updated the other post with this info.