Answer

1. Go to Analysis > Create Calculated Field.
2. Name the calculated field and enter the following formula: 

3. [String1] + [String2] 
   

4. Click OK.

Additional Information

• Using a plus sign (+) combines two string fields together ("abc"+ "def" = "abcdef").
• If a space is needed between the two fields, modify the above formula "abc" + " " + "def"  = "abc def"
• Any required punctuation (e.g. comma) may be added into the formula as needed.
• Concatenating with a NULL value results in NULL. "abc" + NULL = NULL.