Hello Abdur,
Call a microflow in the save button, now in the microflow use create object for OTP_Per. Now copy the value of OTP from OTP_temp to OTP_per.
Hope my answer helps. Reach me out for any queries.
In the microflow you should have the OTP_temp as the Input Parameter and then you should make a new action “Create Object” in which you can select OTP_Per.
in the action, you can choose the attribute to which you want to copy the content, then use $OTP_temp/attribute name of the NP entity.