In May, the group will start to promote the new offers and brands via email and DM marketing campaigns, developed by The Nursery Direct Advertising.
It is spending some £250,000 on pushing Jobsfinancial alone, which is aimed at the City and financial services market.
"For the first time since we have been on our three-year programme of acquisitions, we've decided to focus on the brands that work and rationalise the number of sites we have," explained Harvey Sinclair, managing director of Hotgroup.
Workthing, which Hotgroup bought for £6m from Guardian Media Group in September last year, will host ads exclusively from employers.
Sinclair added: "Workthing will be the UK's only job site to advertise jobs exclusively from employers. It will be broad-based with a focus on sectors such as retail, hospitality, and sales and marketing. We turned Workthing around from a loss-making business in a matter of weeks. This is the next stage."
He claimed employers would access the largest volume of online jobseekers if they advertised on Workthing, as their vacancies will also go on the 'niche site' network: "Workthing will effectively be repositioned as the only job site in the UK that only accepts ads from employers directly. There will be less jobs, but we will have the largest number of client-only brands in one place, from SMEs to retailers like B&Q."
He added: "The industry has been criticised by candidates for the diluted effect of having too many agency ads and canvassing-type agency ads. This change has been long overdue."
His aim is to get the major media giants advertising there.
Hotonline's network of agency sites will be: Planetrecruit; Hot recruit; Jobsfinanical; Jobsearch and The Graduate. They target IT/technology, 18 to 28-year-olds, the financial, general and graduate markets, respectively.