Passing control reg values to Line side

How does one pass DUT control register contents to Line side monitor/data item ? Host side writes value of N to DUT register. Now I need N serial bits to be sent from Line side and collect these N of them in the line monitor. I am kinda of new to ovm and i am using cadence iuc9.2 tool. Thanks.

Some more info- Host OVC writes value of N to the DUT register. Line OVC has sequence_item “logic [N:0] data” and i want to set this N to whatever the host side had fed in and also tell the line side monitor that it should pick N such bits.