Installing the current Test Automation System (TAS) into a central repository allows for consistent use across different Systems Under Test (SUTs). This approach promotes reusability and maintainability of the automation scripts and resources, which is crucial for a company that is expanding its test automation efforts. By using the same version of the TAS, the company ensures that all teams are working with the same tools and standards, which facilitates collaboration and reduces the complexity associated with managing multiple versions of the TAS. Additionally, it helps in streamlining the automation process, as updates and improvements to the TAS can be disseminated quickly and efficiently to all SUTs.

References = The answer is based on the principles outlined in the ISTQB Test Automation Engineer certification materials, which emphasize the importance of consistency, maintainability, and efficiency in test automation practices123.