how to add our own custom pages in bonita 7.1.2 community?

Is it possible in community or efficiency subscription? please help me.

Yes it is,

I found the following by doing a google search Bonita Custom Page

http://documentation.bonitasoft.com/pages
http://www.bonitasoft.com/for-you-to-read/videos/bonita-bpm-7-custom-pages-applications
https://www.youtube.com/watch?v=B34eJdgGdt4
https://github.com/bonitasoft/bonita-custom-page-seed

regards
Sean