Item rule set for copying item EFF to another Item EFF

Summary:

Content (required):

We have a requirement to copy the item EFF information from one item to another item automatically using Item rule set. Items are created in Style -color - size combination as shown in below format and all the items having same style will have same EFF details . when the user updated the item for one style, the EFF details entered should get copied another style another style having same style number but different colour and Size information.

Items

110003-BBK-90

110003-WHT-20

110003-BBK-95

Need support how to create expression for copying the item using item rule set

Version (include the version you are using, if applicable):