Is there a way to...

[Laveuse]

When you're making a house, see all the custom content you downloaded ? Because searching stuff is annoying ;o

[HystericalParoxysm]

You can package the house to a sims2pack and then open that in Clean Installer, but that may not get everything included (such as recolours of Maxis objects).

[aaries16]

I'm not sure how to do it, but you can probably make a collection of objects and other CC you have. I always look in the collection to see the hotel stuff exclusively or any other particular style exclusively without thumbing through it all.