When you import a drawing into Revit LT, you are importing all the elements, such as blocks and external references xrefs from the drawing. They are all contained inside an element called an import symbol. You can explode disassemble the import symbol into its next highest level elements: This is a partial explode. A partial explode of an import symbol yields more import symbols, which, in turn, can be exploded into either elements or other import symbols. This is analogous to exploding in AutoCAD with nested xrefs and blocks. For example, you explode an xref into other xrefs and blocks.
The real benefit of purchasing the suite is in the low cost of buying Revit LT together with AutoCAD LT in the same bundle as this offers significant savings and is the cheapest way to get access to both software platforms. You can of course subscribe to each product on an individual basis if that is your preference, but you will not benefit from best deal on offer.