All design, quantity, packaging and delivery time modifications for OEM custom orders must follow fixed change control rules embedded in our core OEM factory management system that divides adjustment applications into pre-sample stage, pre-production stage and mass production running stage with differentiated cost, time and responsibility allocation standards for each period, clients need to submit formal written change requests with updated technical drawings or quantity requirements to our customer service team, the factory system will automatically calculate additional mold cost, raw material loss and production schedule delay duration according to the current production progress of the customized order and send a formal change confirmation document for client signature before executing any adjustments, all revised order versions and supplementary cost records are permanently archived under the customer’s exclusive order folder in the digital factory platform, unapproved temporary verbal changes will not be recognized by the production and QC departments to prevent inconsistent product standards and unexpected financial losses, this standardized OEM order change control system ensures transparent communication and clear risk division whenever brands need to adjust customized OEM project details during cooperation.