How can I pre-compose layers via AEGP?

Question

Hello,
I would like my AEGP to put some of the layers of the active composition into a pre-composition. Well, the far way I can think of would be to create a new composition, add it to the existing composition, add the footage items of all layers I want to have in my nested comp in there and copy every one of the god knows how many streams, flags and effects to the layers inside the comp.
My question: isn't there an easier way to create nested compositions or at least copy layers with all their effects and so on to another place inside my project?

Answer 1

Thank you. But still, nothing works. I have no idea why.
I try to open a pre-composition I have just built and added to my main composition.
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Here's my source code:
AEGP_Collection2H collection = NULL;
AEGP_CollectionItemV2 coll_item;
coll_item.u.layer.layerH = temp_layerH;
ERR(suites.CollectionSuite2()->AEGP_NewCollection(globP->my_id, &collection));
ERR(suites.CollectionSuite2()->AEGP_CollectionPushBack(collection, &coll_item));
ERR(suites.CompSuite5()->AEGP_SetSelection(main_compH, collection));
ERR(suites.CommandSuite1()->AEGP_DoCommand(3061)); //3061 = open selection
ERR(suites.CollectionSuite2()->AEGP_DisposeCollection(collection));
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Where am I wrong? When I debug, every single line of code is done, but nothing seems to happen.