Can somebody guide me? Thank you

Hello, I don't know if somebody knows how to apply work permit B in Flanders area, high skill catalog. Where can I find the full procedure, as I need to apply it for the employee in our company, he needs to extend his work permit,  what do I need to do?
Can somebody guide me? Thank you

https://www.werk.be/en/information-serv … rk-permits

Thank you, does it mean we just need to prepare below documents and post to immigration office?
Thank you

A fully completed and signed application form;
A fully completed and signed information sheet (by the employee and by the municipal administration);
A copy of the currently valid Belgian residence permit;
A copy of the employment contract if this has changed compared to the previous period of employment.
The employer must also complete the application file with copies of the individual wage statements of the worker concerned for the last employment period (go to the download page with forms).