Numbered Lists - Two Levels on One Line

Hi all.

I have a multilevel list to format, where in some cases there need to be two levels on one line. See screenshot:

Number 5 is fine, as the text on first line is all Level 1. But 6 is numbered (Level 1) and goes straight into an alphabetical list (Level 2). I've put a return in the example so I could still apply the Level 2 Paragraph Style, but it really needs to knocked up a line and be separated by a tab. Is there a way to achieve this while keeping it a properly formatted list using Paragraph Styles?

Hopefully this explains it, but let me know if it doesn't!

Thanks.