@remy, thank you for your quick reply, but this isn’t what I meant.
Here’s the problem:
In Office365 you might want to login to the self-hosted exchange server’s ecp with the same account as you’d like to use for onenote in the browser. If you change the password of that account you’d have to change the entries for both mail.example.org and accounts.microsoft.com.
I’ll give you an example from KeyPass (The only manager with this sort of feature I know): In KeyPass you can add something along the lines of {refByUid:[UID]:userName} to the username field and the counterpart into the password field.
Using tags we could then separate accounts from websites in order to not lose track.
Given that you didn’t understand my request, I’ll assume that no similar feature exists in passbolt. Do you think you might add this feature in future? (This doesn’t have to be official approval)