Journal docs link to each other. Your brand guidelines point to your price list, your price list points to your wholesale terms, and the graph draws the whole business as one connected map instead of a pile of files.

Write [[Price list]] inside a doc and the two are linked. Links are plain Markdown wikilinks, so they also work in Obsidian or any editor.
Open a doc and see which other docs link to it, so you know what leans on a price or a policy before you change it.
Type [[ in the composer and pick a doc. It goes into your message, whichever model you are talking to.
A quote template links to the rate card. The rate card links to the terms. Open one and the rest are one click away.
The graph shows how your notes hang together: which docs everything else leans on, and which sit alone with no links at all.