hi SHEETALKUMAR BHOSLE
try this on your OMT, create 3 antenna with uncombined TX combining/RX antenna sharing using CDU-G.. then choose 1+1+2 on your SCC.. its really possible.. 1 TX cable from first dTRU to the TX1 of first CDU, then 2nd TX cable of 1st dTRU to TX1 of 2nd CDU, then connect TX cables from the 2nd dTRU at position 5 (start count 1 to 6)to TX1 & TX2 of the 3rd CDU.
googleluck!