https://help.tallysolutions.com/docs/te9rel64/Advanced_Features/Advanced_Inventory_Features/Enabling_Item_Cost_Tracking.htm

Enabling Item Cost Tracking

Item Cost Tracking can be enabled from the Inventory Features screen. On enabling item costing for the company, the option Enable Cost Tracking? is available in ledger masters.

To enable Item Cost Tracking,

1. Go to Gateway of Tally > F11: Features (F2: Inventory Features)

2. Set Use cost tracking for stock item to Yes .

3. Press Ctrl+A to save the settings.