To get just the power and clock tree, you probably want selected net extraction. You may also want to mark the IP as "ideal" in your xcell list, if it isn't already. (The xRC manual has a figure, "Device Extraction With and Without Parasitics", that shows the effect of using ideal xcells.)
The method to do this depends on whether you are running from the command line or GUI, possibly what version you are using (though the changeover is pretty long ago now), and what type of parasitics you need overall. The tool manuals (xrc_user, calbr_inter_user, xact_user), which are available in your docs directory, give the techniques but might be using different terms than you have searched on.
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Thank you so much, Sam
I'll try it