Should not be a problem.
There are several options.
You can Merge DXF/DWG files into Archicad onto the Floor Plan or into Section/Elevation Windows or Detail Windows of your Project File.
You can also attach them as XREFs.
You can also create a new file for Details and Merge/XREF into that one. The reason I would consider this latter is two-fold:
1. When DWG/DXF files are Merged/XREF-ed into an AC Project, they bring all their attributes (fills, line types, Layers etc.), so you may not want to clutter up your Project file with those.
2. Since in AC10, you can place Views from one Project into the Layout Book of another, having the Details in another file is not a problem from a publishing point of view.
Others may have other ideas, too.
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