Hi! Is it possible to restrict typing in a cell and the only way to input a text is by selecting an item in a combo box instead?

Basically what I want to happen is like what the list (in Data Validation) does. I want to make sure that all the inputs should match with the source provided. I already created a macro where in a form will load once you double click a cell. This form has a combo box that contains 18000 items (that's why I didn't use List in the Data Validation). Could you please give me possible solutions? Thanks!