I have 33 demand sites, so if i have to input numbers by my hand, i have to input 33*12*3=1188 numbers. of course i can but it is a stupid way. please help me to use ReadFromfile way.

If you have time series data, the best way to add it to your model is with the ReadFromFile function. See http://www.weap21.org/WebHelp/Read_From_File.htm for more information.

For entering many expressions at once, it is sometimes easier to enter the expressions in Excel. You can export the structure to Excel, add or edit the expressions, then import them back in to WEAP. See http://www.weap21.org/WebHelp/Excel_Export.htm and http://www.weap21.org/WebHelp/Excel_Import.htm for details.

Jack