If you are using Qlik server edition, just publish the base sheet with full data loaded to all the users and once they create all the sheets in the app in their personal space - duplicated sheets. Goto app objects in the QMC and change all the owner of individual sheets created by them to your user. so it will show in your user my sheets then publish from your user.
Or you can use this backup restore extension, and take backup of apps as json and combine it and try restoring. ( not tried this, may be attempt it and inform us if successful) Qlik Branch
Hope this helps
I appreciate the responses very much. But, the discussion veered off on a tangent. Admittedly, I was very interested to see if anyone knew whether any technique was available to copy a sheet from one app to another. Other threads indicated that it was not possible. But, there's always hope. Lakshmikandh Karthikeyan offered a definitive and final answer. Thanks.
However, please note that the app-to-app sheet copy was not the primary focus of my question/problem. In order to copy a 'sheet' from one app to another, it is necessary to create a new sheet in the target app and copy the source sheet contents - chart, text and filter objects one-by-one into the new sheet.
The nasty and time-consuming problem I'm dealing with is that, when I edit a sheet, select an object, copy it, go to a separate sheet in edit mode and paste it, it works the first time, and sometimes the second time. However, the object that is copied soon becomes 'locked' into the copy buffer. When I go back to the source sheet, select a different object, return to the target sheet and paste, the object that was copied in the previous copy/paste is pasted - not the object most recently copied. In order to restore the copy/paste operation, I have to refresh the browser screens. Sometimes refreshing doesn't work and I have to close the browser in order to restore the copy/paste functionality. This results in lots of wasted time doing something that should be easy and straightforward.
I'm looking to see if anyone has insight into why the copy/paste doesn't work properly, or if I'm doing something wrong.