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How to make an object not visible to GI rays

I am working in a dynamic lighting environment (all lights are moveable with raytracing, no baking with lightmass).

I have GI bounce light coming in through the windows into a room. There are curtains over the windows which I am treating as semi translucent (sheers). I am using an opaque shader with ss which has a nice look (translucent shading is not working very well in terms of a look).

When the sheers are over the windows, they are blocking most of the gi rays coming in. Is there a way to have the model not visible to gi. In other software packages there is usually an attribute/parameter to disabled this. for example in clarisse, “visible to global illumination”. Is there an equivalent in UE?

Cheers,
Jim

For anyone else wanting to know, looks like this can be done in the in the static mesh editor