Simply way to make sub vi and call it form main vi

I'm a beginner and have major problems to make a sub vi and call it from main vi. I'm going to do a save dialog where is extra info for my saving and want to call dialog from main vi and after that save info to a file or database. I want that save dialog appears after i press button. I attach sub vi where is no functionality yet.
Attachments:
save_dialogsub.vi ‏21 KB

The first step is to connect the controls and indicators that you want to pass information to and from your main vi.
You right-click on the icon at the top right corner of the Front Panel and select "Show Connector". Typically put inputs at the left and outputs at the right side of the connector pane. Save it.
Open the main vi. Go to the block diagram. Click on "Select a vi" inside the Functions Palette. And choose the sub vi you prepared. Then wire it up inside your main vi.
-JLV-

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Simply way to make sub vi and call it form main vi

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