How to convert a LOAD COMB to a REPEAT LOAD
To begin with, the difference between LOAD COMBINATIONs and REPEAT LOADs are explained at the following wiki
http://communities.bentley.com/products/structural/structural_analysis___design/w/structural_analysis_and_design__wiki/29299.difference-between-a-load-combination-and-a-repeat-load
A LOAD COMBINATION can be very easily converted to a REPEAT LOAD case using the STAAD.Pro command editor and making the simple syntax change as shown below
LOAD COMBINATION :
…
LOAD COMB 100 DL+LL
5 1.0 6 1.0
Equivalent REPEAT LOAD :
LOAD 100 DL+LL
REPEAT LOAD
A Macro and user guidance to use it can be found in the below link.
STAAD User Tool: Extract LC info/Convert Load Combination to Repeat Load