Modifying the established reference in Toovalu Impact is possible. Pour cela, il faut se rendre dans l'administration de Toovalu puis aller dans "Organisations". To do this, you need to go to the administration of Toovalu and then go to "Organizations".
Next, you need to press the button "Access the projects" (see below).

Then press the button "Modify the reference".

Once on the reference, there are two possibilities: either modify the posts and/or sub-posts by clicking directly on them (see the blue arrow below), or add a post/sub-post by pressing the add button (see the green arrow below).

Once the reference is modified, it will be possible to create a collection line and link it to a sub-post. To do this, you need to click on View the data entry form then on Add. You will then just need to fill in the desired information.
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In this way, you were able to modify your own reference and adapt it to your needs!