How to add a button to a custom table that opens a form in a new tab and automatically fills out with data from that table
Prepopulate module can pass value to form with query parameter.

Simple example:

&lt;a href="/node/add/content?edit[title]=This is the title" target="_blank" class="btn btn-primary" role="button"&gt;New form&lt;/a&gt;';


More examples can be found on its documentation.

If you find problems, please check this issue, some known bug has been introduced from 7.x-2.1 version. You may need to patch it.