delete item without deleting history

[ltep]

Hi,
I have many manual created items. The same items exist in the Windows by Zabbix agent active template.
How can i delete the manual created items without deleting the history? The Windows by Zabbix agent active template should redicover the item with the history of the manual item.
They use the same key.

[ltep]

For example:

I have HOST1 with a manual created item "State of service Dhcp".
The Windows by Zabbix agent active template has the same item in its discovery rules. The discovery will skip the item because it already exists.

I want to move the data history from the manual item to the discovered item. Then delete the manual item.