Can I deploy a war file inside a built in/embed application server(like spring boot)?

Question

I had been working on a project where I need to deploy a sample war file inside a built in/embed application server.

• Suppose for an example, I need to deploy sample.war file inside a spring boot application which has built in/embed tomcat server.

  or

• Deploy a sample.war file, inside a built in jive application which has a built in/embed tomcat application server. Note: As installed server has webapps or any other place to deploy.How is it possible to deploy a war if the server is of type jar/any other format ?