2.  Upload your new template to test blog. 

3.  Go to Dashboard. Click to Layout of current blog (not new test blog) –> Edit HTML –> search for: <div id=’sidebar’> copy all widget code between <div id=’sidebar’> to </div>

4.  Now Go again to Dashboard. Click Layout (at new test blog) –> edit HTML –> search for <div id=’sidebar’> –> paste all widget code that you have copied. Put it between <div id=’sidebar’> too

5. Save

6.  Download and save full template of test blog

7. Upload to your current blog layout, and you get new layout without deleting widget