As you know, tags are usually organized into groups. For example, there can be a tag group named Contexts, or Categories, etc.
You can collect topics using either any tag from a given group or using the needed tag.
To collect data using a required tag just add this tag to a topic and click Collect data:
Collection data by tag group also is not complicated. First, there are predefined keywords for groups "Contexts" and "Categories", so you can type "Categories" on a collection topic and click Collect data. All topics containing any tag from the group "Categories" will be collected.
What if you have your own tag group? Not a problem. Add its name into configuration map in the same way as Contexts and Categories (find them in the configuration map and you'll see how to do this). So you may have keywords for all your tag groups.
Adding a concrete tag may be not so easy. You need to remember not only its name, but its group too. Or you need to find it in another map and copy it. Not very convenient. There are two ways how to make it easier:
1) Add all your tags into the Common Lists. When needed, just open the Common Lists and add the tag from there;
2) in Configuration Map, in keywords branch, create a topic, name it by tag name and set required tag to it. Now you have a keyword that collects topics with this tag.
Click Open Demo map on MultiMaps ribbon, then choose the template Icons and Tags (click it) to see how one can deal with tags.
Topic tags in MindManager are case sensitive. That is, tag "Costs" and tag "costs" are different tags! By default, data collection by tags is not case sensitive, i.e. topics will be collected both with the "Costs" tag, and with the "costs" tag. But if you want it to be case sensitive, use the "casesensitive" macrolanguage operator in the topic notes with this criteriа.