Custom Document Creation

Hi ,
We have been trying to create a new Doc type in ERP which we use internally ,So far i had tried to create the Custom Doc Named : aaaaa this is a part of operation usually happens before closing the Work order /Job card - Where i could not able to proceed further as my doc Format ,fields ,rows & columns is totally different as compared to ERP .

Could anyone help us how we can proceed further .

Thanks
Sundar.V