No this is not possible.
To avoid importing 'managed' items incorrectly, it is best to either import all materials as 'unmanaged' and then change to 'managed' by editing the item individually. However, if there is a large number to change, we suggest you take extra care checking the CSV file and change to 'managed' before you import the materials.
If you have very few to change once imported, you can request the change be made via the Support channel.
Note: A fee may apply if the number is excessive.
Have a look at similar frequently asked questions or visit our FAQs page for more information
