How can I copy an object to another .pbl In Infomaker 12

We have Infomaker 12 and there is an object that I would like to copy to a different .pbl but I haven't been able to work out how to do this.  Online resources suggest simply dragging from one file to the other the tree view, but I don't seem to have a tree view at all.  Is anyone able to assist?

Thanks
Sarah 

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