How to get Anywhere Door (dokodemo door) Doraemon Story of Seasons

Mandatory :
1. Befriend the Pent
2. Befriend the major
3. Befriend Doraemon
4. Has copper pickaxe

Event:
When going to Major's house, Nobita will trigger an event where Major's house wants to be renovated.
Pent will tell you that the major has asked for a new door to be built with the door material of Doraemon's everywhere.

Pent will give Nobita a door anywhere, as long as Nobita gives gold ore to make a replacement door for the major.

Get the gold ore mined (must use copper pickaxe) around on the 3rd to 5th floor.

After that give gold ore to Pent and the major will give the door anywhere to Nobita.