How do I wire from underneath the car into the cabin?

Give us some info on what you are trying to do, and you’ll get the best advice. Right now, we have no idea what the wire is for, or what you are trying to accomplish. Trust me, there are people here that want to help...... but you have to help us.... help you!
 
Drill a hole. Use a grommet .

Use existing grommets depending on the wire
Sorry guys I figured it out . Thanks for your help.