Actions with Sub Items

For Sub Items,

  1. Is there any Query API to get the list of Sub Items for a given Item ID?
  2. Can a Sub-Items be converted to Item ? [i.e. Remove its Parent] ?
  3. Can the Parent of Sub-Item be Changed ?

Hi @TechOpsHub! I see you posted here as well, so I will be closing this post and continuing in the other one.

Thanks!