we are trying to migrate from TFS to Azure Devops and as part of the migration want to migrate work items. I had tried using VSTS-work-item-migrator and vsts-sync-migration tool for migration but couldn't be succesfull in doing that as there are some customized WIT's in current TFS. Can anyone suggest what would be best approach to do migrate without any data loss.
Note: We don't want to use import database approach.
Freelancer DK
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There is tool call nkd-agilty migration tool which is used from all kinds of migration from tfs/AzureDevOps to another https://nkdagility.github.io/azure-devops-migration-tools/
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For your demand,I am afraid there is no such tool available at present.These migration tools should not recognize your custom process.So it is not feasible to migrate custom work items to azure devops via tools.
To migrate complete data from TFs to azure devops, it is recommended to use the method of importing the database.
This is guided in other case and docs. For details,you can refer to these.
TFS to VSTS migration - The official import option which will import 1 project collection into 1 VSTS account. It automatically imports everything stored in the backup. At the point of writing this, the TFS must be upgraded to TFS 2018 and some work item template customizations must be removed (there are a few well documented features unavailable on VSTS).