Trees are not a mesh item. You can only LINK them, attachment is not possible unless you use dummy objects that they are linked to, and then attach the dummies as an array.
Have you tried Planting them using the brush Option and then linking?
If you want the Letter Option you mentioned, you have to either Buy Speedtree and create the text with the options in that program, and importing them. Then you can change the materials as desired.
You can create actual trees outside Speedtree that have a mesh to be attached, but you may or may not have the Wind options available, dependent on how well you can design soft cloth or spring reactive leaves and limbs.
You can also create Particle or Billboard trees, but you may be disappointed in their looks. Lots of work regardless. You do have the alternative to Speedtree purchase to make your own, as it stands today.
Now, that you are fully confused, think about it.
phantasma8 (3/14/2016)
I am trying to merge a tree into a dummy prop so I can use a bunch of them together to form an object but I can only "link" them and not "attach" them to get 1 or any of them to merge into an object to save as a prop . I get re-directed to the tree link section when attempting to attach the dummy prop and it wont allow me to attach so I can merge them at all.. am I missing a step to save a bunch into a prop ? where is the "merge" option for trees? why is there no "attach" option in the plants section? can they not be used as props and I also noticed absolutely no texture options when it comes to plants? what if I wanted to use my own leaves (video or jpeg) or bark? but my main focus is on making them into something like letters out of bushes and save as a prop.. I can always chroma-key the textures with other editing software, please help me try to go green and show me a direction I might be missing thanx
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