By using fields, you don't need to maintain email signatures for all employees. Instead, you maintain only a few templates.
You create an email signature template by inserting fields, which will pull information found in Employees menu.
You only need to insert the dynamic fields in your signature where employees will get their own data inserted:
How to insert fields
Watch how to use preview to see how employee data is merged.
If you have different company names and locations, then the information is effectively maintained for each employee in Employees menu:
If all employees are working in the same company and location, then you can remove the fields and just update directly in the template: