adding tune

Iwant to make custom tune with winols and add it to my onboard tuner is this possible

I can't comment, but for those who have the knowledge to do so, including the specific vehicle details - make, model, year, transmission, etc - would allow them to make a more informed comment.

To add onto Gord's suggestion, also include the the brand/model of the "onboard tuner" you're referring to.

Many diesel tuning platforms allow .bin import. You may have to adjust format slightly depending on vehicle make model year and flashing tool protocol.

Best answer I can offer for the amount of info in the question.

Nick