You cannot simply "upgrade" a business entity from an enterprise to a private limited company. The process involves incorporating a brand-new company, renegotiating contracts, transferring assets and liabilities to the new entity, and eventually closing down the existing enterprise. This transition is a comprehensive process that requires careful planning and legal compliance.
 

您不能简单地将商业实体从企业“升级”为私人有限公司。该过程包括成立一家全新公司、重新谈判合同、将资产和负债转移到新实体，并最终关闭现有企业。这一过渡是一个全面的过程，需要仔细规划并遵守法律。