Hi @_Stella_,
You can create this node via the Children method with a POST request. You just need to figure out the id of the Masterliste node.
Also have a look in this thread, there are a couple of example in there as well how to retrieve the node id
Below is an example to create a child note.
Uri
_api/web/Navigation/GetNodeById(2006)/Children
Body
{
"__metadata": { type: "SP.NavigationNode" },
"IsExternal": true,
"Title": "Post Here",
"Url": "https://powerusers.microsoft.com/t5/Microsoft-Power-Automate/ct-p/MPACommunity"
}
