Here are a couple suggestions.
Look at the posting thread on this site: dynamicsuser.net/.../76494.aspx
Also, you might be interested in this add-on (www.axtension.com/.../axtension%C2%AE-kitting) which appears to have a pretty robust kitting functionality beyond native AX functionality.
Please update with your feedback.
Please find the useful blog:
Many Microsoft Dynamics AX users have asked for a solution that supports kitting. To support a kitting solution, two primary components are needed:
Configuration of a kit for the order management
An activity that assembles the kit