To concatenate text, just position the text side-by-side in the Dynamic Variable field of a Change action. For example, to form a code such as “AF-1234-GB” you might do this:
SET To Dynamic Variable |audience.sender.preference-audience.sender.code-audience.sender.county_code|
Where preference = AF, code = 1234 and country_code = GB
Conducttr knows that the “id_number” attribute is a single line string and hence concatenates the strings.