The deals will see Capital provide a wide range of hardware, including photocopiers, printers, scanners and print management software, to new and retained clients in the corporate and public sectors.
It says additional service provision, including comprehensive national maintenance and training support, is expected to add significantly to the value of the deals over the next four to five years.
Tom Flockhart, founder and managing director of Capital Document Solutions, said: "It's been an extremely busy period for the business. The acquisition of Highland Office Equipment has secured our position as a truly national player. Equally, we have added key personnel to ensure that we maintain the necessary skill levels required to retain our reputation for outstanding service across the whole of Scotland."
Capital's turnover was recorded at £21.5m last year, which was an increase from the £16.5m registered in 2012. This was following the company's acquisition of Inverness-based Highland Office Equipment last February.
The expanded company expects turnover to top £24m by the end of 2014, which would put it on track to achieve its target of £30m by the end of 2016.
Capital currently employs 200 people at operations in Edinburgh, Glasgow, Dundee, Aberdeen, Inverness and Shetland. It has recruited 22 people in the past six months, including four in January.
Established in 1979, Capital is Scotland's largest independent supplier in the sector.
Its customers range from government bodies, local authorities and oil and gas companies to the voluntary sector, as well as a wide spread of universities, colleges, and also independent schools.
Last year, Capital was re-appointed as a successful supplier on the Scottish Government's national framework agreement for office equipment.
The business also recently invested a total of £1m in its national IT infrastructure and enhanced training and workshop facilities.