I am trying to put together a database of building costs that will have a
drop down list that includes such elements as Flooring, Ceilings, Decorations
etc.

If i pick for example ceilings, i want the next cell to have choices limited
to Suspended Ceilings, Plastered ceilings, or if i had picked Flooring to be
limited to Carpet tiles, Carpet Sheet, Vinyl.

Could anyone assist on this

Thanks in advance.