On a work order you can delete or add components without affecting the original bill of materials.
From time to time a certain component may no longer be used in a bill of materials and needs to be replaced everywhere it is used. You can viewed where a certain component is used by running the Components Used in Items report. This report is available from the Item List. After opening the list, check one or more items then from the toolbar select the Components Used in Items and click Print.
When you are ready to replace a component, again open the Item List and from the toolbar click List - Replace Components. Select the component you want to replace in the first drop down and the replacement component in the second drop down. You can also optionally select whether you want replace the component on open work orders as well.