Using Insert Content from PDF you can insert the content of a PDF file on your current page.
The content of the PDF is inserted in the current page of your open document. The content is positioned using the Trim Box of the source document: if the Crosshair is enabled, the content is positioned at the bottom right of the Crosshair, and if the Crosshair is disabled, the content is positioned centered on the current view.
The layer structure of the inserted (source) content and the open document will be merged, following these principles:
If a source layer name matches a layer in the current document (case sensitive), the objects will be inserted in that layer, on top of all objects in that layer.
When inserting in a Normalized PDF, objects from Processing Step layers are inserted into a regular artwork layer with the same name as the Processing Step layer.
If a source layer doesn't exist in the current document, it will be created on top of the current layers, and have the same printing state as the source layer.
You can't insert into a hidden layer. If the target layer is hidden, you will get the option to cancel or to make the target layers visible before inserting.