Not atll the softwares in the suit is needed for me, Is it possible to install ,say Sheets, in a stand alone way? I couldn't find any answers from google search.

If you install from the packages provided by your distribution, it depends on how the distribution packaged the components.

That said, most of the code is shared among the various components, so you wouldn't save much space (almost nothing by today's standard) by not installing some of the them.