As stated below, talk to financial advisor yourself but this is what I learned ...
Fidelity manages the current HPE 401k. Talked to a local office advisor (watch out ... they try the hard sell to be the person working with you). The old HPE 401k account (that houses the Roth and 401) remains "managed under trust". It can grow from only current assets (including "dividends") but cannot be contributed to by you.
To make it grow any more you need to have Fidelity personnel transfer the HPE 401 account to an individual 401 account, and they can ensure the transfer will not violate any IRS tax laws or incur additional taxes. You will have some tracking paperwork the for "rollover", but the transfer of funds is entirely electronic and in-house instead of a 20-day process that requires drawing a physical check.
DXC manager is Hewitt Financial. Transfer of your 40 fund will be the same old painful process. And the fund choices in the DXC plan are pathetic.