a) You could place all your Support projects in a Project Category called Support Projects, and then just query
category = "support projects" AND ...
b) If you can't organize your projects into a Project Category, it'll be more difficult: The "Project" field doesn't work with "contains" operators, so you'd have to list them one by one.
project in (SUP-Alpha, SUP-Browning, SUP-Cathode, SUP-Deliverance, SUP-Emily, SUP-Frumplebottom) AND ...
... but these tend to break as soon as you add a project or delete one of the old ones.
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