Using Skillate you can post a job on different job boards and invite more applications for your job. For this please go to Job Name > Source Candidates > Job boards.
Depending on different job boards configurations you'll have to an initial bit of settings. In case of IIMJobs, all you have to do is provide your IIMjob's recruiter account credentials for the first time. After which you'll be able to post a job on IIMjob.
Skillate will automatically credit a candidate's source as the name of the job board through which they applied.
Note: Please read the policies of different job boards before posting, in some cases it's an irreversible action.