The International Linear Collider (ILC) is an electron–positron collider with a total length of approximately 20 km. The International Development Team (IDT) was established by the International Committee for the Future Accelerators in August 2020 to prepare for establishing the ILC Pre-lab as the first step toward the construction of the ILC in Japan. IDT-WG2 is now identifying the accelerator-related activities for the ILC Pre-lab necessary before starting the construction of the ILC. The ILC Pre-lab activities is expected to continue about 4 years and the following accelerator-related activities will be carried out: (1) Technical preparations; (2) Final technical design and documentation; (3) Preparation and planning of deliverables; (4) Civil engineering, local infrastructure, and site. This document summarizes the “Technical preparations”, i.e., accelerator work necessary for producing the final engineering design document. It is anticipated that this document will be a starting point to discuss the international cooperation and technical efforts to be shared as in-kind contribution among the participating laboratories worldwide. It is also expected that the budget requests by the participating laboratories to their funding authorities will be made with reference to this document.