Account Update Plugin

Hi,

I am new to the Dynamics CRM 2013 plugins, 
On Account entity update I need to update the associated entity field.

Account entity I had a custom field new_Storename when I enter the value and save the record I need to update the associated records store name same as the account store name. On Store custom entity I have a new_name as the store name.

Account to Store entity I have 1: N relationship.

Thanks,