Editing form and skiping steps

i'm using adobe life cycle designer 1 week, still learning.
i'm able create form, work language, able save form in xml format, , able repopulate form data xml file.

now need know-
1. after repopulating data in form, how can edit , save data in same file? i.e, how can edit form?
2. want make intelligent form can offer skip steps. example - if registered member can select radio button (yes/no), if answer yes, don't need fill information next section , can jump following section. possible? how?

thanks lot.

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