You can't jump between frames of a sequence structure, but you can place a while loop around it which will cause it run over and over. Then, you can place a case around the code you don't want to run and use the case condition to decide whether or not to run it.
A more elegant solution would be to use a state machine which allows you to go to a different state each time. Search for it on this site to learn more about it.
To learn more about LV in general, I suggest you read the LabVIEW user manual. Also, try searching this site and google for LabVIEW tutorials.
Here is one you can start with. You can also contact your local NI office and join one of their courses.
In addition, I suggest you read
the LabVIEW style guide.
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