If your account supports different brands, you can post your jobs to whichever brand you choose. This designation is made when you post or edit a job. When you post a new job, the brand will default to the primary company. To change this, select Change Brand and select the brand that should be associated with the job. 
 

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Here, you can also add a new brand to your account (which is also accessible by navigating to Account > Manage Careers Page and then clicking the Create New Brand button). When you click Add Brand, you will be prompted to fill in fields for the brand name, company links, and photos. 
 

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For more on setting up brands, click here.