You can synchronize tags across different projects, so that two or more projects increment the same variable, with the project-level Tag Sync property. When you set a Tag Sync property for Project B equal to Project A, you establish a parent-child relationship between Project A (the parent) and Project B (the child).
When you run a project with a Tag Sync property, the system checks to see if any of the tag variables in the child project match variables in the parent project. If the $B variable is used in both tags, for example, and the parent project is on run 7, the child project uses the next value, 8. After run 8, the next run of either project is run 9.
If no variables in the child project's tag format match variables in the parent project's tag format, the Tag Sync property has no effect.
Only the variables in the tag are synchronized, so you can still distinguish between different projects.
For example, if you define two projects as shown in the following table:
And you then run the projects alternately (Project A, then Project B, then A and B again), your completed jobs list shows the tags as follows (with the last run shown first):