You can use one of these solutions:
http://crm2011autonumber.codeplex.com
http://advcrm2011autonumber.codeplex.com
you can click on "Documentation" tab to get the installation and configuration steps.
You can use one of these solutions:
http://crm2011autonumber.codeplex.com
http://advcrm2011autonumber.codeplex.com
you can click on "Documentation" tab to get the installation and configuration steps.