I have 4 to 5 Builds on TFS problem is each Build has 1000+ variables, so all i want is there any xml or any other file so i just import my variables or any other possibles solution without writing variables in each build.
Answer will be highly appreciated.
Yes, you can use PowerShell script to do this if you are talking about the variables in vNext build.
You can create a PowerShell script with following command:
Write-Host "vso[task.setvariable variable=testvar;]testvalue"
This will create a "testvar" variable with "testvalue" filled. Then you can use it in the later build steps by entering $(testvar).