Sharepoint lookup not included in the list

[julleus]

Hello,

I two different sharepoint list named:

1. Requests

2. Item master

In the "Requests" sharepoint list, I have a column there named "Item request" that uses "Lookup" from the "Item Master".

My question is some item is not yet included in the "Item Master", how can the user manually put a text that is not included in the item master, will that be possible? 

Thank you.

[#2]

@julleus You will need to verify all items in Item Master List first whether it's already fully exist all the data.