Just copy the relevant files to your work account's OneDrive. Alternatively you can share them directly out of the personal OneDrive account, but the options therein will be limited. There's no way to configure a two-way sync, if that's what you are after.
Trying to Synch Between Two Onedrive Accounts on Same Computer
How can I synchronize between two folders/subfolders in two different Onedrive accounts on same computer (W10). The computer is my personal computer, which I also use for work for firm. Computer bought before I joined the firm, set up under my own personal Microsoft account, have a Onedrive icon on the left panel of File Explorer that lets me access that personal information under my own MS account. I also have another Onedrive account/icon there, which is for my firm-related work product. I brought a bunch of clients I had previously with me to the firm. Those clients' work has all been stored under my personal account in various client subfolders. So that other people in the firm can access that work, too, via the firm's Onedrive account (in the shared folder), I'm trying to synchronize between the two MS/OD accounts (but on a limited, client-specific/subfolder-specific basis). (In other words, I don't want to move all my preexisting work product over to the firm account.) How can this be done? Thank you