Combining multiple layers in an existing map to one layer

I am trying to combine the layers on a warehouse map into one layer. Is there an easy way to do this? Right now the layers are setup based on the types of architecture and my ultimate goal is to make layers based on the departments that work in each section.

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Consider the LAYMRG Command.

+1 Absolutely the way to go.

I get the error message "Cannot merge current layer" for a few of the layers that I am trying to merge into this. In the properties I don't see anything different with the objects; also in the layer properties I don't see anything different compared to the other layers. The file size seems to be a bit too large (16mb) otherwise I would attach it here.

Grab all the objects, pick a layer, done.

If you have 100 layers and 20 go on one layer, and 20 on another, etc, then freeze them all, thaw the 20 you need, then see above.

Layer Translator will do it too. (LAYTRANS)

I get the error message "Cannot merge current layer" for a few of the layers that I am trying to merge into this. In the properties I don't see anything different with the objects; also in the layer properties I don't see anything different compared to the other layers. The file size seems to be a bit too large (16mb) otherwise I would attach it here.

Change your current layer to one that is not involved in the merging.