Hello @n4speed,
You can follow the Getting Started with the i.MX RT1160 Evaluation Kit guide, which explains how to build and run an SDK multicore demo on the MIMXRT1160-EVK, as shown in the image below:

The SDK version 25.06 includes several examples that demonstrate dual-core implementation.
To install the SDK for IAR, please refer to the second step in the Getting Started guide, titled "Get Software".
BR
Habib