Passing Variable to sub-VI saved in llb folder

[Copperwhite]

Hi,
I wish to pass a variable to a sub-VI saved within an llb folder. I call this sub-VI from the main-VI by wiring the sub-VI path into a property node (this works fine-other considerations mean that the sub-VI must remain within the llb folder). But now to develop further I need to pass a variable to this sub-VI from the main VI. Since I cannot wire directly to the sub-VI icon how may I pass the variable ... maybe Global variable - but maybe there is a better way?
Thanks
Robert

[johnsold]

In LV 7.1 the Call by Reference Node has a connector pane that allows passing parameters to the called VI and returns data from the VI. This is just like wiring to the VI. I have not used this in a real application so I do not know much about the behavior.

Lynn