Hi @James_C
If they are one legal entity, you could use one account with multiple trading styles.
However, if they are different legal entities, it may be better to keep them separate for auditing purposes. You may wish to take a look at Affinity accounts which allow you to access multiple accounts with one email address and password. Affinity is also charged differently which makes it more cost effective where more than one account is involved.
I’ve included some links below which may help: