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Dashboards do not implement symbolics themselves however they are symbolics aware.
When a dashboard opens it executes each query in turn. If a query uses symbolics then these are captured and stored in a Symbolics Bag.
If a subsequent query uses symbolics then these will also be captured. However, if the symbolic has the same name as one that has already been captured for a previous query then it will use the previously captured value from the Symbolics Bag.
This can be very useful if, for example, a dashboard is being created with various queries all related to a selected Project. The first query will prompt the user for the project and then all queries will use this same captured value.
Note: It is the user's responsibility to ensure that the symbolics, defined with the same name in different queries, are of the same type (e.g. String / Integer / Item) otherwise one or more of the queries will likely fail to work as required.