You can import Visio files to a process model.

Steps to import a Visio File

Open the process model to which you want to import Visio file.
Go to File > Import Process Model.
Click From Visio (see Figure 26).
Figure 26: Import Process Model sub-menu
The Open Visio VDX file window is opened ( see Figure 27).
Figure 27: Open Visio VDX File window
Browse and select the required Visio file and click Open Visio VDX file.
An application message is displayed (see Figure 28). This message is automatically closed when the file gets imported.
Figure 28: Importing selected Visio file application message box
The respective Visio file gets opened in the Modeler for the selected process model.
Save the Process Model.

When a Visio file with multiple sheets is imported in Process Modeler then a Select Page window opens. You can select the respective page required to be imported from the drop-down list (see Figure 29).

Figure 29: Select Page (Visio File)

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