You can attach associate existing aMessages on project files (from same or other projects accessible to you) to the form you are creating if its form settings allow so. Below are the steps to associate an existing file aMessage while creating a new form:

Before proceeding further, remember to ensure that the file aMessage you are looking to associate with the form is part of the projects that you have selected in the project filter.

Follow the steps to create a form.

Click on More Options icon at top right side (available based on relevant form settings configuration) to associate docs, aMessages or forms. To associate an aMessage, click on 'Associate aMessages' option as seen in below screenshot.

Similarly, the option to associate aMessages will also be available while replying to an form as shown in below screenshot.

Based on form settings configuration, the option to associate aMessages can be available while editing an existing form as well.

A popup will appear wherein aMessages can be selected to associate from the same or other projects accessible to you. Select the aMessages that need to be associated by using the search filters available at the top and then click 'Associate and Close' to proceed further.

In case you need to associate multiple aMessages by navigating to separate folders, use the 'Associate' button to associate selected aMessages in current folder and then navigate to the other folders one by one and associate other aMessages accordingly. Click 'Associate and Close' once done.

The aMessages selected for association will appear at the bottom of the form.