@Joli can you elaborate on what you are trying to do? What exactly do you mean by "combining into one"? Grouping multiple objects, like @Carbon shows, is one thing, but there is also merging objects for printing with multiple materials. But perhaps you mean something like putting a Mandalorian helmet on a Buddah statue. The latter can better be done in a dedicated modeling application.
I have several models of glasses (drinking vessels) and I was trying to add a lion face to the surface as decoration. However, as you suggest, a dedicated modelling application might be a more suitable way. I have been slightly spoilt by using Craftware Pro which does do limited CA modelling and I was trying to get Cura to do the same.
Click on ALL models holding the "SHIFT" key, then right click on mouse and select "Group Models".
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