You can select an object through a surface in the model by pressing the W key. This is a one-off function, so you have to reselect it, if you want to select more objects through a surface.
How to do it
As an example, trim a profile to a surface through another surface.
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Select a profile. Select several profiles by holding down the Ctrl key.
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Right-click and select Trim to Plane.
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Move the cursor over the surface, which you want to select through.
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Press the W key. The program will make the nearest surface transparent. Keep pressing the W key until the desired surface is visible.
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Click the surface.
Why it’s useful
You can access the surface without hiding objects.