Is it possible to subtract the content of one cell from another in excel using formula?

Question

Is it possible in excel using any formula to subtract (or whatever appropriate terms we can call it) from one cell to another so that the third cell will contain the rest of the portion. For example, If Range("A1") contains "I am not sure" and Range("B1") contains "not sure" and as a result the Range("C1") will have "I am" when subtraction is performed.

Original data are like:

ColumnA            ColumnB   
I am not sure      not sure
The sky is blue    is blue

Applying any excel formula, after subtracting Range("B") from Range("A") , The Range("C") will contain the rest of the portion like below:

ColumnA            ColumnB      ColumnC 
I am not sure      not sure     I am
The sky is blue    is blue      The sky

Answer 1

使用“ Substitute功能和“ Trim删除前导/后缀空格

=TRIM(SUBSTITUTE(A1,B1,""))

Answer 2

You could potentially do it this way: