Try doing a CSG-ed sphere, like the following:

difference {
	sphere { bla bla bla  --- make is big}
	box { bla bla --- to cut everything but the top of the sphere }
}

and then difference that shape with whateer you want.

Matt Moose wrote:
> 
> I need to make a hemispherical dome with a thin metallic surface,
> similar to a pocket watch cover, and pierce it with simple shapes. Can
> anyone advise on how to do this please? (The piercing of these shapes
> must not interfere with other nearby objects if possible, as the shape
> holes are making way for other objects to poke through).
> 
> Many thanks for all the help I've received here so far
> 
> Matt.

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