How can we give access to edit or create Campaign hierarchy?

Hi Geetika,

This may help you.If Missing then let me know.

https://help.salesforce.com/articleView?id=campaigns_hierarchy_setup.htm&language=en&type=0

https://help.salesforce.com/articleView?id=campaigns_edit.htm&type=0

https://developer.salesforce.com/docs/atlas.en-us.salesforce_campaign_implementation_guide.meta/salesforce_campaign_implementation_guide/campaign_setup_set_sharing.htm