If there is already an existing pom and want it to be deployed together with the 3rd party artifact, set the pomFile parameter to the path of the pom.xml.
mvn org.apache.maven.plugins:maven-deploy-plugin:2.8.1:deploy-file -Durl=file:///C:/m2-repo \ -DrepositoryId=some.id \ -Dfile=path-to-your-artifact-jar \ -DpomFile=path-to-your-pom.xml
Note that the groupId, artifactId, version and packaging informations are automatically retrieved from the given pom.
Note: By using the fully qualified path of a goal, you're ensured to be using the preferred version of the maven-deploy-plugin. When using mvn deploy:deploy-file its version depends on its specification in the pom or the version of Apache Maven.