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Form inheritance is to extend a form with a other form this will give the original form all the methods/variables/elements/properties/parts of the extending form.
The inheritance is not limited to 1 level, for example if you have form a, form b and form c you can extend form b with a and c with b form c wil then have all the methods/variables/elements/properties/parts of form a, b and c.

Form a:

Form b:

Form c:

Setting a super form

On a existing form you can set the super form by going to the properties and setting the "extends" property to the super form.

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