I think the sequencer load (SQL) instruction is the closest instruction in RSLogix 5000.
Personally, I don't like these type of instructions and usually use some kind of indexed array for this kind of thing. It seems simpler to me.
RSLogix5000 has a very good instruction set help built in. It can be found by clicking on help, then instruction help. It is probably a good place someone with limited RSLogix5000 experience to start.