A) How to set the number of item on Overview page
1.Go to commerce -> Website -> Website Configuration
2.Take My Account tab ->RECENT TRANSACTIONS QUANTITY TO SHOW -> Set the needed number here
3.Save
B) How to change the name of item option on website ,PDF etc
1.Go to Customization -> List, Records ,Fields ->Transaction Item Option
2.Search the field id of the field which you want to change the name
3.Then change the label of the field and save.
C) How to do the set up for ship items on to two different address
Go to Website Configuration -> Take Checkout tab -> Enable the option Pick up in store