Burndown and velocity are artefacts of Scrum sprint methodologies, which, in Jira, are done by boards, not projects
But the single most common start point for it is 1 project, 1 board - so a board selects simply "project = XYZ". It's even one of the defaults for creating new boards.
Anyway, all you need to do is define a board that selects issue from several projects. The easiest thing to do is something like:
1. Define a new saved filter, something like project in (ABC, GHJ, XYZ)
2. Go to create a new Scrum board, and choose "create from saved filter"
3. You'll almost certainly want to re-map some of the board columns and do a few sprints (if your filter doesn't pick up older ones from the projects), but once you've got the right status into the last column, you'll be able to get cross-project burndowns and velocity reports from it.
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