How to Create Vendor Purchase Order and Service Entry Sheet in SAP with explanation of each point II

[@notesmitra]

Please help me out- 1-"how to do service entry with multiple lines altogether in one service number" ?
2-"how to add freight charges in po as per no. of material quantity received ?
Please help

[@manjunathjogi610]

Sir give me the full details about t code

[@erpsapteam]

ME21N -CREATE PO , ME22N - CHANGE PO , ME23N- DISPLAY PO , ME29N- RELEASE PO , ML81N - CREATE SES, ML83 -PRINT SES, ME9F- PRINT PO