That depends on the product you're using. If you're using Qlik Sense Desktop or Qlik Sense Cloud, you can only embed a single Qlik Sense visualization or object: https://help.qlik.com/en-US/sense-developer/April2018/Subsystems/Mashups/Content/SingleIntegration/single-integration.ht…
If you are using Qlik Sense Enterprise, you will have the ability to embed the entire app or just a sheet from an app: https://help.qlik.com/en-US/sense-developer/April2018/Subsystems/Mashups/Content/Embed/embed.htm
I hope that answers your question,
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