Reference
You can change the default form for a particular public folder so that when a new item is created, it will use a custom form. This procedure requires Owner permissions on a public folder.
1. If the Folder List is not visible, click the Folder List button at the bottom of the Navigation Pane.
2. Right-click the public folder for which you want to specify the default form, and then click Properties.
3. In the When posting to this folder, use box, click the form that you want others to use.
Note To copy, install, delete, and update forms in this folder, click Manage on the Forms tab. You can also specify available forms in a public folder by selecting an option under the Allow these forms in this folder box.
If you are interested in this topic, you might also be interested in learning how to Change the Form for Existing Items in a Folder.
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