Stuffing partial cargo into container in one point, then truck the container to another point to add more cargo stuffing might be made cargo damage and loss during delivery.
Furthermore, pre-cool is well prepared at carrier's yard prior 1 day p/u empty container, hence we could not support yr requirement as below mentioned.
The option for yr considering for this case:
1. p/u Reefer container and do pre-cool to RB BPL as original planned
2. use another truck for partial shipment to BJL, then delivery to RB BPL to combine