website field don't follow when I create a lead

Hi, In lead menu, website fiedl doesn't exist. So,In crm_lead , I created a new field about website . this name is "x_website". I can create a customer and to fill website field. But, once I create a lead and I choose a company, website field don't follow. Part of crm_lead form: Do you have a solution to propose me? Thanks in advance.