Universal Takeover of Beneficiary question

Hello all,

I have a question about the process needed to complete a universal takeover process for an ITN. 

One of our beneficiaries is a company in Italy, which recently sold some of its business units to another company (including the units related to its participation in the project) in the same country. The "old" company, the one that is a member in our project, will continue existing for some time, but not for long. Our EU PO said it's the case of an UTRO, but since the old company will keep existing (the new company also has a different VAT and different bank account), I do not know what is the process in the portal. The manuals I find are a bit vague and all mention to update the participant register, but I do not know what this means. The new company already has a PIC number and has been validated.

Can anyone help?

Thanks!