Existing record identification

The To / Where the associated record is section provides the option of using an existing record.

If the Existing Record radio button is selected, the second record will be a specified record that currently exists. When the Existing Record radio button is selected, the third section looks like the one in the following figure.
Figure 1. Associate Records (existing)
The image is explained in the text.

Specify the value for the Module and Object properties so that this task knows what kind of record you want for the second record. Then click the Record link to find the specific record you want this task to use.