Please attach your packaged workbook as a ***.twbx
On the surface the type of filter you are describing would be boolean and yield true/false values
may not meet your needs but it would easier to see the data
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I think you're on the right track.
but first, you should decide what you want to show and what you want to use as a filter.
Do you want users to select the city names(location) and list all the owned restaurants?
In that case, your calc field should be contains([Location],[LocationParameter])
then you'd place that as a filter shelf with "True" to be your default value,
use the parameter as your users' filter.
But, one thing if I remembered correctly, I don't think we can select multiple values for parameters boo
Hope this helped.