I think Steve is misled by your title, he thinks you want to embed a simulation project created with Captivate into a ppt. When I read your question I suspect you mean combining two Captivate projects, one based on a ppt, the other one a software simulation. Could you confirm?
If my suspicion is correct, you have two ways to achieve this:
- Use an interactive object in the first PPT-based CP-file, and link to the published Simulation project. You have to be careful when uploading both not to break the link. Are you publishing to HTML or to SWF?
- Combine both projects in one CP-project, which is pretty easy provided they have both the same resolution (width and height in pixels). Open both projects, each will appear in a tab. Select the slide in the PPT-based project, after which you want to insert the simulation slides. Switch to the tab with the simulation project, select all slides in the Filmstrip, Copy them, go back to the first project and paste them. To provide navigation within that project you can use an interactive object (like a shape button, click box or button) to jump to the first slide of the simulation. You didn't specify which type of simulation: demo, training or assessment? If you publish to MP4 as Steve suggests, you should have lost all interactivity, which is especially important for training and assessment. If it is a demo, I would recommend not to use the classic capture (slide-based) but the Video Demo to have better quality if you opt to publish to MP4.