To increase the business license, you need to prepare some necessary materials, including the original and photocopy of ID card, the original and photocopy of business license, official seal, etc. Then, go to the local industrial and commercial bureau to submit an application for approval. After the approval, pay the relevant fees and get a new business license. You can change the tax registration to complete the addition. Although this process takes some time and energy, it is usually not too complicated as long as it is carried out according to the prescribed steps.