Inventory Valuation Method Feature

Inventory Valuation Method Feature

Zoho added another feature so called Inventory Valuation Method of each Item. This is actually good to see and it will benefit us so much but I have a question on this.

For Existing Items that already have transactions, Zoho made it a default and assumed that all items are FIFO based. How can we move those item from FIFO to WAC? Do you have any recommendations on how to change the Inventory Valuation Method of existing items aside from item cloning?

It seems that this "new" feature will only benefit the future created Item and future Zoho Users. How about your existing loyal customers?