connecting main vi and sub vi

[anushaas]

Can anyone tell me how to connect the attached Timer.vi to a main. vi ?

Clicking on START button of main.vi, the control should go to the Timer.vi 

[altenbach]

Start here

[crossrulz]

Please take some of the tutorials, as this is so basic:

3 Hour Introduction 
6 Hour Introduction 
LabVEW Basics
Self Paced training for students 
Self Paced training beginner to advanced, SSP Required
LabVIEW Wiki on Training
Learning NI
Getting Started with NI Products

You might also want to read up on using a State Machine and Event Structure.