I need to publish a service using ArcGIS Server Manager but it request a file with (.sd) format! How to convert to (.sd) format ?
You could use ArcGIS Desktop (Arcmap) to publish a GIS Service. Publishing a map service—Help | ArcGIS for Desktop
In case there is no connection between ArcGIS Desktop and ArcGIS Server, you can save an SD file while sharing it a service > Copy the SD File to the Machine with ArcGIS Server > Publish the Service from ArcGIS Server Manager using the SD file.
To add to Jayanta Poddar's comment, I suggest reading About service definition files—Documentation | ArcGIS Enterprise if you are going to be working much with ArcGIS Server.
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