In addition to custom types, you can also use common tags. As custom types are defined per category, common tags are common for every category (contracs and meetings) in your organization. So you can use them, for example, to index your documents. Tag a contract with common tag 1.2.3. and you can use that same tag in a meeting or in an HR document.
Tip: If you would like to have certain set of tags available for your users to choose from, (even if no actual document has the tag yet) you can create one sample document which could have the main type "Template" and add all the tags you would like to have. This way if some tags are not set to any document (except the template document), the users can still see all those preset tags.
Please note: Common tags are visible for every user in your account, even if they don't have user rights to all categories.
Please note also: When you create a common tag in a document category (Contracts, Finance & Admin, HR, Other or Transfer Pricing), that tag will not be visible in any meeting category (Board, Shareholders, Other, Executive) until you take it into use in a meeting. This also works vice versa. This functionality is because we want to reduce excessive information i.e. we hide redundant info until you really need it.