Lists tool designers create all new form templates in Microsoft Office InfoPath, and then import these templates, saved in InfoPath as form template solution (.xsn) files, into the Lists tool.
To start a new form:
Although designers can start new form templates directly in InfoPath, we strongly recommend starting new form templates from the Lists tool designer. Form templates started from the Lists tool designer are initially set up with all features required for importing the Lists tool, plus additional features common to most custom Lists tools.
Click New Form in a Lists tool to start designing a new form template in InfoPath that contains the following built-in features:
Note To use lookup fields in a Lists tool, designers must create form templates starting from the Lists tool designer.
The new form displays in the Form Templates list, and a corresponding view is automatically created. For example, if you import a form template file named "Topic.xsn" in a new Lists tool, the list of form templates and views appears as follows: