Is it a PTO model or an ATO model ?
Is 'Parent Item 1' a standard item or a non bom object / attribute in Configurator ?
Are you using out of the box Invoice print report , or is it customized? If its customized then you may be able to embed this logic there (in the Invoice Print program) ?
Parent Item 1
We are just researching this option before we implement anything with the configurator but the ATO model seems to fit our need more.
Parent Item 1 is a standard item right now where we put the child in the BOM which then we now can't label it with a price because we don't want it to go off base pricing we want ti to be the custom price. If I understand your question, we would want the Parent item 1 to be a non-bom object (text line) so then the child items would control the price and cost of the parent. Sorry, if I took that question in the wrong way.
We customize our invoices with an XML template.
Thank you for your time