Exit dimensions record the last dimension item, and retroactively apply it to all hits in the visit. Exit dimensions are available for all variables with pathing enabled under Traffic variables in Report suite settings.
A given exit dimension is based on its associated traffic variable. If the non-exit variable has data, its associated exit dimension also contains data. No implementation changes are required for exit dimensions if your traffic variables contain data.
Since exit variables are typically based on custom strings in your implementation, your organization determines what the dimension items are. Values in a given exit dimension match dimension items in its associated non-exit dimension. For example, dimension items in the ‘Exit page’ dimension contain similar dimension items in the ‘Page’ dimension.