Step 1 - Create a new diagram
In erwin EA, create a new instance of the diagram type you would like to import the Visio diagram as (this can be an out of the box or a custom diagram type).
Save the diagram.
Step 2 - Import the Visio file
From within the diagram, select the Import menu and select the Visio File option.
When asked, select 'Click to upload' to upload a VSDX file (containing your diagram) from your machine, for mapping.
When the file is loaded, select the Next option.
Select the sheet you would like to use from the VSDX file, using the drop down arrow.
Once the sheet has been chosen, the shapes identified from the sheet will be presented for mapping.
Select the object type you would like to map to each identified shape, using the drop downs for each shape presented (the object type offered are the ones allowed on the diagram type you chose).
Once all of the shapes have been mapped, select the Next option.
Map all of the association types that are used by existing concepts on the diagram.
Once the associations have been mapped, select the next option.
The diagram is now imported into your erwin EA diagram.
Note: Visio import is not available on Entity Relationship Diagrams.