Using Multiple Storyboards in iOS

These are the best articles I've seen on multiple storyboards.

• Storyboard best practices
• Linking storyboards with segues

Not only does this guy tell you how to create a new storyboard in code, he

• recommends multiple storyboards in practice (more modular code)
• discusses when to use xibs vs storyboards (xibs hold views, storboards are based on controllers)
• provides a class for linking storyboards with segues on github

Note that this last point is important because the key downside of multiple storyboards is that you can't usually link them with segues, but robs library allows that with a bit of fudging

Also see the discussed here

The OP edited his question to include the answer:

UIStoryboard* storyboard = [UIStoryboard storyboardWithName:@"HelpStoryboard" bundle:nil];
UIViewController* initialHelpView = [storyboard instantiateInitialViewController];

initialHelpView.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:initialHelpView animated:YES];

Of course, where you call this from is meaningful, because you might have 2 storyboards and their view stack in memory. So probably best if you call this code from outside the other storyboard's view controllers.