One way:

Allow: Custom
Formula: =OR(ISNUMBER(H1),H1="ID",H1="ND",H1="MS")



In article .com,
"DWW" wrote:

I am looking for a way to validate cells so that they only accept
numbers(decimal) <-- easy part and 3 text choices ("IS", "ND","MS") not
so easy :)

IS-insufficient sample, ND-non detected and MS-missing samples.

any help would be appreciated.