Import an .axmodel file using Microsoft dynamics AX2012 Management shell:
Open the Microsoft dynamics AX2012 Management shell from Adminitrative tools.
At the command prompt, type the following command, and then press ENTER.
axutil import /file:<filename>
This command installs the specified file in the same layer that it was exported from.
If the installation fails because of a conflict and still you want to import the model to resolve conflicts,you can rerun the command, and use the /conflict:push option to push the element that has the conflict to the related update layer. You can then resolve the conflict.
axutil import /conflict:push /file:<filename>