I apologize for thesome bits can be buggy I ended up doing it so you just select the string and touch the mouse icon in you inventory to combine. If you are holding an item you dont want just click right mouse to return to your cursor, hope that helps a little.
Some plays I had had little glitches and then when I revisited worked fine, after voting I am going to try and clean up improve and fix these issues.
Thanks for letting me know :)