How to perform a series of replacements in an array based on whether a separate condition is satisfied?

I am trying to piece together a series of replacements if a separate condition is satisfied, specifically:

If array x (table with variables, and variable 5 contains numbers such as 10, 30, 40, 60) contains 35, then - replace all '60' with 'z1' - replace all '40' with 'z2' - replace all '30' with 'z3'

If not, - replace all '60' with 'y1' - replace all '40' with 'y2' and so forth...

[Jan]

What is "array x"? Please post a short example, such that the class gets clear.

[Boushra Dalile]

it's basically a table with various columns, and one column (column no. 5) contains numbers: 40, 60, 30, 50, 70, etc...

sorry for not clarifying initially.