Yes, you absolutely have to report the sale.
If you only had one line of work, you would only file one Schedule C, no matter how many people you worked for. If you had more than one line of work, each would need its own Schedule C.
If you used it and took deductions for it for each different type of job, then you have to prorate the usage between the jobs as well as the personal portion. I would advise you to do it on paper first, as it can be tricky, and once everything adds up, then enter it on each Schedule C.
