You can re-order your parts on your equipment grid by clicking off the "Sort by MFGR" icon . Once that is off, it will toggle the standard "parts" view for your equipment. To proceed click on the "parts" tab within the folder you'd like to re-order.
By clicking the "parts" tab, you will see a list or BoM of everything within that folder that is a material. Simply click the black arrow and drag the parts up or down accordingly.
When re-ordering the parts, you will notice that the "pos" or position column will change with the order you dragged them. This position will be the order in which your parts are displayed on your document.