Not sure what do you exactly mean by UPLOAD? I guess you want to create Job orders in Oracle R12. There are 3 options for the same;
1. You can release the Jobs through MRP/ASCP, by releasing planned orders for make type of items.
2. You can create manual WIP Jobs, through WIP responsiblity>>Discrete Jobs>>New.
3. You can interface the WIP jobs from other legacy systems, through interface tables.
Please rate this, if you have satisfied with above answer.