Hi @Tamayo, Ashley
I think you can use Placeholder Properties and HTML Tags to achieve your requirement.
I did a test.
1.First double-click the text box to open the Placeholder Properties.
2.Then select "HTML..." in the Markup Type option.
3.Then we set the value and use the replace function to replace "store" with "store" in red.
=REPLACE(Fields!Text.Value, "store","<font color='red'>store</font>")
Preview:
Best regards,
Aniya