Hi @Mohammad Hasan ,
For exporting all the recommendation (and alerts if you need) from the Security Center to Sentinel, you need to enable 'Continuous Export' from Azure Security Center.
For that, follow the below path:
In Security Center go to Pricing and Settings -> Select your subscription -> Continuous Export -> Select 'Log Analytics Workspace' tab and switch the toggle to 'ON'.
You can select the checkboxes of the items you want to export. Example attached.
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