Prabuddha,
Well, if you are new to this software, perhaps you are not aware that Product Masters and Location masters are not usually created directly within APO, they are interfaced over from the Online Transaction Processing system(OLTP) (usually this is an SAP ECC system). In this way, the master data in APO can always be kept synchronized with the similar data in the OLTP.
.MASSD is not really the best tool for uploading masses of data, although it is pretty good at making mass changes to data. Online help for this can be found at
http://help.sap.com/saphelp_scm70/helpdata/EN/93/b4c23b67a5d051e10000000a11402f/frameset.htm
The program itself is pretty intuitive. You decide which type of object you wish to work with, you decide which tables within that object you wish to use to select and update, you decide which fields you wish to update, and you decide the contents you wish to place in each of these fields. It can be run interactively or it can be run as a background job.
A better tool for creating new data is Legacy System Migration Workbench (LSMW). You might want to consider this, if you wish to create masses of new products and locations locally in APO.
http://help.sap.com/saphelp_scm70/helpdata/EN/ad/2d54a41d7011d2b42e006094b944c8/frameset.htm
However, the best tool is the standard replication of data from OLTP, using the core interface.
http://help.sap.com/saphelp_scm70/helpdata/EN/36/d5d83773c3522be10000009b38f842/frameset.htm
There is a step-by-step guide to replicating data between OLTP and APO found in Best Practices. You will need two of the building blocks,
Connectivity
http://help.sap.com/bp_scmv250/BBLibrary/HTML/B02_EN_DE.htm
Replication
http://help.sap.com/bp_scmv250/BBLibrary/HTML/B05_EN_DE.htm
Best Regards,
DB49
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