Product with revisions

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We are integrating Legacy system to GTS 10.1 system.In legacy system users maintain products by versions (21 to 21.X,21.Y etc..) and will add the classification for each revision items

My question - How can we handle these products when transferred to GTS? In GTS there are no Master Data fields for these items.

Is there a possibility to add a character at the end in GTS to classify?

Can some one share the solution/approach?

Thanks

-Srinivas