Do I have to seek approval from the RIPE NCC before entering an LIR-PARTITIONED object into the RIPE Whois Database?

No, this is strictly a RIPE Whois Database feature and RIPE NCC will keep no record of these LIR-PARTITIONED objects. Responsibility for errors and problems arising from the use of LIR-PARTITIONED remains entirely with the LIR concerned. In addition, LIR-PARTITIONED objects are disregarded when evaluating requests for an additional allocation. Only ASSIGNED "status:" objects are counted towards the 80% usage requirement.