How much does a new computer cost for a FSC? Are the funds donated using a donation slip? How is the money directed to a computer for a specific FSC?
You might find some relevant material in the 2022 Center Operations Guide.
Also see help article, Purchasing Additional Computers with Donated Funds. https://www.familysearch.org/en/help/helpcenter/article/purchasing-additional-computers-for-a-family-history-center-with-donated-funds
and Accepting Donations at FHC https://www.familysearch.org/en/help/helpcenter/article/accepting-donations-at-a-family-history-center