When the condition (IF or ELSIF) you need to build require more than TWO 'elements' then you can use the manual Condition Builder :

You have available the
LIST of all COLUMNS
LIST of ALL OPERATORS
LIST of ALL FUNCTIONS
You can copy paste your condition from any outside text editor
You can hand write your condition
You can use the inbuilt condition builder to help you write it :
1. Place the cursor where you want to add a condition
2. Select a COLUMN (single click)
3. Double-Click on any FUNCTION
the "Expression" part will be replaced by the selected COLUMN
ie : select CITY and double-click on Instring(Text, Expression,1,1) and the Condition Builder will add after cursor position this Instring ( Text, CITY , 1,1)
Double clicking on any OPERATOR simply adds it after cursor position.
This is the type of condition you could build :

city <> 'JACKSONVILLE' and city <> 'MEMPHIS' and city <> 'LA PORTE' and city <> 'ORLANDO' and statecode <> 'FL' and statecode <> 'IL'
These manual conditions can be used as any types of conditions (IF / ELSIF - non linked to another condition - single condition - linked to Functions or as FILTERS)
NOTE : all STRING values MUST be QUOTED
IMPORTANT NOTE : The Condition Builder has an inbuilt evaluation feature
ie : after entering any condition text value etc, simply use the TAB key of your keyboard and the ICON will display the result either in GREEN or in RED !
if for example you have a spelling mistake in a column or a function then it will be displayed in RED (the condition returns FALSE)