We set a prefix to our components in a design based on sheet number.
REF_DES_PATTERN ($PHYS_DES_PREFIX)($PAGE _NUM)[0-9](01)
When we reorder sheets it is a manual effort to modify the location (ref des) to start with the new sheet number. We always use two digits for the sheet number. i.e. U0101, U0203, U2301, etc.