Build a multi-select attribute on a dynamic lookup and call it A. Build a multi-select attribute on a parameterized dynamic lookup and call it B. Can attribute B use attribute A for its parameter in the attribute? Currently, this is not working, is this configuration supported in Clarity PPM?
For a parameterized lookup, unfortunately using a multi-value / multi-select lookup as the source that determines the display in the secondary target lookup is not supported. You would have to use a single-value lookup for the source. See the Configure Lookups section in the Documentation for more details on lookups.