When you are creating your job post, there is a button on the top of the page on the 'Team Story' tab where you can click 'Write a STORY for each posting'
By clicking this, you will be able to edit your company info separately for each project. You will also have the option to copy previously entered company info to use as a template.
If you are still having trouble, contact Wantedly Customer Relations Team from here!
Sorry for the inconvenience :(