Visible if calculated field with 2 options

Question

Hi all 
 I am trying to make a field visible if a field called Install/SO equals "Supply and Fit" or "Supply Only" - how do i write the calculation for this as i only know how to do this for one parameter. 
 
 equal($pr_project_type_c,"Supply and Fit") 
 
 how do i add it to include "Supply Only" as well? 
 
 thanks so much in advance

Penny Whitlock · Answer

hi, you can use the isinlist create list formulas 
 isInList($account_type,createList("Customer","Partner","Investor")) so if you reference the field and then add in all values in the create list as above or rough example below 
 isInList($pr_project_type_c,createList("Supply and Fit"," "Supply Only"))

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