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Personally I don't tend to use the getpropertyvalue/setpropertyvalue functions (in favour of operating on the attribute reference entities/objects directly), but in testing, both functions will return an error if the supplied tag name does not correspond to an attribute reference held by the block. As such, issuing a call to getpropertyvalue prior to setpropertyvalue will offer no benefit in this case. Instead, you could account for errors using the vl-catch-all-apply function, e.g. the following will return T if successful, else nil: (not (vl-catch-all-error-p (vl-catch-all-apply 'setpropertyvalue (list obj "QUANTITY" (rtos (* di ht) 2 3)))))

You would have to set the value to test looks like it always returns nil. (if (setq x (getpropertyvalue obj "QUANTITY")) (setpropertyvalue obj "QUANTITY" (rtos (* di ht) 2 3)) ) Let us know. can't test in BricsCAD. side note I think entity names work as well doesn't have to be a vla-object name.

Would this be a good starting point? It trims a single polyline however could be modified I think for many objects inside a circle

So I'm guessing that you don't use or have any named page setups. Page setup information (window location, page size, etc.) is stored on a per-layout basis in the drawing. If you are not saving it, then you can't expect it to be there when you go back.

Yes! Is your object snap on when you are picking the window points? What about if you save a page setup, does the saved page setup get altered?

Do not use plot windows. Set your template to plot by layouts. Set it and forget it. Never fool with it again.