Wanted to change bulk "Change Task Template" to new sub type

Hi @AK_12943638 

You have to do it manually, There is no API that support the template type change.

1. Create new template as a subtype of a change task.

2. Disable the root template.

Also you can check an existing tool. 

There is a utility that can be used to change a object type but, it works just for all objects of the type. 

CS368420 - How to change type of existing objects with "ChangeTypeSql" utility in Windchill

Change the Type of the Existing Objects in Windchill PDMLink

PetrH

Hello @AK_12943638, 

It looks like you have a response from our community champion. If it helped to answer your question please mark the reply as the Accepted Solution. 
Of course, if you have more to share on your issue, please let the Community know so other community members can continue to help you.

Thanks,
Vivek N.
Community Moderation Team.