Related issues not getting carried out

[Rahul]

When I am moving any issues from one sprint to another sprint the child issues under the parent issues are not moving. Only the parent issue is getting moved to New sprint.

[Nic Brough -Adaptavist-]

Welcome to the Atlassian Community!

Sub-tasks are not sprint items, they do not go into a sprint themselves.  You can say that they are in a sprint when their parent issue is in a sprint, because they are a part of the parent.

So, I'm not really sure what your question is, because you seem to be saying you are moving sub-tasks into a sprint, which is something you can't do.