There is a capabillity insid CES to import "PinPkgLengths.txt".
For further information go to:
First you need to create a text file for pin pacakge lengths. Usually IC vendor provide your with a CSV file of pin package lengths, so you are able to create this text file by copy. After the text file is ready, just run \7.9EE\SDD_HOME\ces\win32\bin>sidefile2icdb.exe while CES is open.
The text file should be like below format(the delimiter should be space not tab):
BTW, sidefile2icdb need the snapshot name and top bolck name, you can find from CES(clicking menu output-design status)
CES really takes the package lengths into count.