Question

How can I add a new header/footer for a report(for example picking list report in delivery order) other than the header/ footer defined in the company?

Answer 1

In report tag put header=’False’,
eg.

<report header='False' auto="False" id="report_product_history" 
model="product.product" name="stock.product.history"
 string="Stock Level Forecast"/>

it will not print the default header define in the company.
then in rml file find <pageTemplate> tag, and replace it with your rml code.
eg.

 <template pageSize="(595.0,842.0)" title="Test" 
        author="Atul Makwana" allowSplitting="20">
        <pageTemplate id="first">
         ***Your rml header & footer***
        </pageTemplate>
 </template>

This way you can put new header and footer.