Hi Vishnu,
The t-lanes could be created automatically if you have CIFed below data:
- Purchasing info record, contract & sch. agreement.
- Special procurement key in material master.
Check below link
Automatic Creation of Transportation Lanes - Master Data - SAP Library
In your scenario what is valid? If you have purchase info record then it should automatically create these.
Let us know in detail whether its between plants or one plant and 50 suppliers etc. Though try creating source list in ME01 with all plants for this material and in CFM1 for object purchase info record, click "Include Dependent Vendors and Issuing Plants". Check thereafter. DO one round of testing in test environment.
Regards
Rahul