My company is a manufacturing company of automotive parts,and it is called Witzenmann Ltd.
= My company is a manufacturing company for automotive parts, and it is called Witzenmann Ltd.

Witzenmann company has a long history of 160years.
= The Witzenmann Ltd. has a long history of 160 years.

And it is also global company which loated in 13countries and it has more than 20branches.
= And it is also a global company which is located in 13 countries and it has more than 20 branches.

Witzenmann is a someone's name who create company.
= Witzenmann is the name of the company's founder.

To tell you in detail, we have made bellows of automotive elements.
= Perfect

It is the flexible elements of automotive exhaust system.
= It is the flexible element of the automotive exhaust system.

I'm in tere, I design;
= I'm part of the team who designs them.

um sorry I don't have enough time kk I will continue tomorrow ..
= Sorry I don't have enough time kk I will continue tomorrow.

Hi Cole,

This is already a good introduction for your company. You may continue with describing your roles and responsibilities.

Please take note of these points when writing:

 - Always capitalise the first letter of the first word in a sentence.
- Separate numbers or amount from the items being described.
 
There were just minor lapses on spacing, but I think your sentences and word choices are clear and concise. Keep this up. You're on your way to being a good writer.

Cheers,
Marie ^_^

(P. S. Looking forward to the continuation).