Want Objects from Layers to Show up in Base Layer

You can also go into slide layer properties and deselect hide other slide layers. That would keep the layer open until it's triggered to hide. You still would have to deal with what you want to show and not show and that's where determining when to show or hide objects come in handy as Judy mentioned.

Depending on how complex it is, I'd forgo the layers and do as Judy noted since the end user doesn't know if it's a layer or base slide.