This is what I want.

I want a tool that works on top of micorsoft word.

I type a lot of proposals, many are the same with different tweaks to each section.
There are about 20 topics or sections of these proposals.
Some sections do not apply to each proposal.
I want a tool that provides me with a check list of every section name.
Then let's say I choose for 7 of the twenty sections.
Of those 7 selected another box appears with options on which language/paragraph to choose for that proposal.
It inserts those paragraphs and basically types a document for me.

-typed on iPhone