Hello Hassan,
Using two images at the same time on one instance is not possible (can not run two operating systems at the same time unless if you are
nesting them, and that is not currently available for Windows) Thus, adding the image that contains the MS SQL server won't work with your existing Windows image.
You have two options:
1. Install Microsoft SQL server (application) on the existing server that includes the application like the instructions in this
Microsoft guide. But I am not sure if the version mismatch would be an issue. However, that requires applying a license (if you have one) through Microsoft License Mobility per this
document.
2. Create a new Microsoft SQL server instance from one of the offered images that we have, and migrate your application instead, and delete the current one. (could be an easier option)
As this platform is meant for general questions about the platform, and for further technical help about the above, please post on
serverfault.com where you have a larger community of enthusiasts and experts to share ideas with and get support from.