Change number format dependent on column group name

I have the following as a row expression to have a running value by the group Department.  I want to know how to change the number format for only the Department group of "Customer Count".

=RunningValue(Sum(Fields!Amount.Value),Sum,"Department")
rcowen00Asked:
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Mike EghtebasDatabase and Application DeveloperCommented:
This is front-end functionality not a database. Who sees this data and where the user sees this data?

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