In a standard FCOM a fuel index table for the center tank can be found under FCOM/PER/LOD/WBA/FIT/10/. It shows on our planes an index of -2 for 1500kg in the center tank.
The whole information about the load and trim sheet in my fcom is about 3 pages, not that much to go on, including a nice note on the load and trim sheet: "GENBERIC EXAMPLE, Irrelevant Data! Do Not Ue For Operational Purpose!". But then, the use of manual loadsheets is not an approved OPS procedure for us anyway. The approved manual W&B calculation is only via (iPad) software which does include all the information without writing it all out. But even that is considered non-standard as centralized load control is the standard method, of course they do use a software as well. Airbus FCOMs can be used instead of a standard OM B apparently, our boeing fleet uses a normal OM B, the airbus fleet the standard airbus documentation instead which does not include a W&B manual.