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Level 10

When you reference your fragment in the mail form it will be placed in a subform container. It is that subform container that is referenced by the instance Manager to be able to add/delete subforms from it. The button woudl go on th email form and woudl reference the subform containing the fragment (like any other add/delete of a subform). Remember that the fragment gets resolved before render so from the form's perspective it is all one continuous XDP file.

Hope that helps

Paul