Hello @akashdubey,
There are two main import tools for OMP: the tab delimited content plugin, and the Native XML plugin. Not knowing the details and format of your data, it’s hard to say which option might be best. There are some differences in importing OJS and OMP content, but you may wish to check out the data import section of our admin guide. This forum post also includes some helpful information on considerations for an OMP import: OMP - Best workflow for back issues - #2 by asmecher.
Roger
PKP staff