@tamara1
if you are in the US, and I think this is true for other countries as well, ...... food for thought
IRS Pub 583, Page 5 - must keep separate books per company
and for sole proprietors
IRS Pub 334, page 40 - "If you have more than one business, you must figure your net profit or loss for each business on a separate Schedule C."
IRS Pub 334, page 45 - separate schedule C for each business