Tablix Group Properties Dialog Box, Filters
Select Filters on the TablixGroup Properties dialog box to limit the data specified in the selected group.
Add a new filter clause to the list.
Delete the selected filter clause from the list.
Move the selected filter up in the list.
Move the selected filter down in the list
Type or choose the expression to which you want to apply a filter. Click the Expression (fx) button to edit the expression.
Choose the data type for Value. When possible, choose a data type that matches the data type for Expression.
The values in Expression and Value must evaluate to the same data type. For example, if Expression is set to a field that has the data type System.Int32 and Value is set to 7, from the drop-down list, choose Integer.
If the data type option you need is not in the drop-down list, write an expression to convert the value to the correct data type. For more information, see Filter Equation Examples (Report Builder 3.0 and SSRS).
Choose the operator to use to compare the expression and the value.
Type the expression or value against which to evaluate the expression in Expression.