How to make report based on custom field

How to make report based on custom field

Hi Gentle men , 

Under the organization there are more than business line , So that I create a custom field called " Business Line" in each of Purchase order , Sales Order , Expanses . ect.

Now I wan to sort or display  the sales order or purchase order based on Business Line , So any advice to achieve that  ?

how could I know the total sales or total purchasing of specific business line, ect.

looking to your help.

Thanks