Digitization forces the retail industry to develop new and innovative business models for their customers. Omnichannel (OC) retail integrates different sales channels and enables a seamless shopping experience. Many OC concepts place the traditional store in the center of retail operations and enhance its role with new responsibilities. This thesis assesses different store-related planning problems related to OC business models. It applies operations research methods to evaluate each planning problem and derives managerial insights as well as further research opportunities.