I have a dimension that contains five type of filters (All, Null, Emergency, Normal and Standard). If I want that dimension to only show Emergency and Normal data, do I need to create a calculated field? If so, what calc would I use?
Duplicate your dimension. Place the copy on the filter shelf and set it to include only Emergency and Normal. Then place the original dimension on the filter shelf and set it to show Only Relevant Values. In your viz or dashboard only reveal the original dimension.