Some times STAAD brakes the loads specification like releases, Truss Property parameters brakes in several part and even after merging this problem not solved , How to get rid of the problem ?
You may check this Wiki for the explanation and solution: Assigning Properties, Specification, and Design Parameters using Beam Groups - RAM | STAAD | ADINA Wiki - RAM | STAAD | ADINA - Bentley Communities
It is a time-consuming process as the number of operations increases. and what about UDL it is line load which is also brakes in several parts !!