Business partner: switch from custom account group to forwarder

Dear community,

In our SAP strategy we person respective concern partners with roles for vendor, vendor-fi and lawsuit with a customized relationship group. These concern partners are forwarder. To usage the SAP logic for shipping strategy we present request different relationship radical 005 for forwarder for them. We privation to usage the aforesaid concern partners with the caller relationship radical 005. 

So my question is, is it imaginable to alteration the relationship radical of concern partner? If yes, is determination immoderate instruction?

Best regards

Isabelle