Hi Ray,
not sure I've understood what you ask.
It isn't possible to write on a node, so I assume you create a dummy, say Node1_Dummy, Node2_Dummy where you memorize the values 100, 200, if you doesn't want to memorize the result you can simply add a formula on the A,B,C... otherwise you must write some logic to memorize the result using another dim value, f.e. another datasrc value.
Kind regards
Roberto