Copy Guides and Markers
Having the ability to copy guides between comps and copy markers between comps would be an amazing workflow addition. Currently you have a duplicate comps and paste layers into the comps where you have the guides or markers that you need.
Please implement this

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Jess McMillan (AE Dev @ Adobe) commented
Additionally, here is a link to the official posting on this new feature: https://helpx.adobe.com/after-effects/using/modifying-using-views.html#main-pars_header
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Jess McMillan (AE Dev @ Adobe) commented
Hello D,
While not exactly the workflow you mentioned (copy/paste) we have added the ability to export and import guides between comps, layers, and footage items.
Simply set your guides and go to the menu item: View->Export Guides... to create a .guides file with your current guides, and then view the comp, layer, or footage you would like the guides to be placed on and import the file you just created with View->Import Guides...
This will not delete guides already on that item - so if you only one the new guides, make sure to clear your old guides first View->Clear Guides