First of all will move in menu of master in that their is item submenu as below shown in image.
After selection of the submenu the new window will reflect as below shown in image.
Add the item detail in highlighted section and click on submit as below shown in image.
After item get added if there is some change you want to update it then you select the particular item from list and update it in highlighted section and update as shown in below image
Select the particular item from the list add text synonyous and submit it that synonyous will update againt that selected item as shown in below image.
Again select the item from the list and choose the multiple file upload it after upload done it will reflect at down as shown in below image.
Select the item from the list after selection it will reflect the detail of preferred vendor as shown in below image.