Grouping / linking objects from different layers
Hi Illustrator ! It would be great if there’s a feature to group objects and not have them in the same layer. Many instances I want to be able to resize/multiple select different objects (frim different layers) at the same time without having to select each of them individually everytime.

Dear users,
Can you please let us know what is that you cannot do with the existing 'save selection' functionality that you expect to do by grouping objects from different layers?
'Save selection' enables you to combine objects from different layers without having to bring them into one single layer.
To use 'save selection' just select your desired objects and save the selection from the select > save selection menu command or from the bottom of the layers panel.
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Jenna Roosdett commented
Like in Photoshop, I'd like to link paths (like PS linking layers) that does not group them together, compound them, or reorganize them within my document. I just want to be able to select one piece and have it select the linked paths at the same time, even if they are alternating with other paths within my layer.
(See Image: Shadows alternate level on layer, flat–shadow–flat–shadow–etc. I would just like to select those shadows all at once, while also having the same gradient within other non-linked paths).
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Mike Sexton commented
Would like to be able to group items on different layers while keeping the group intact. This would be especially handy when using the Esko cut software (cut layers). With this option, I would be able to group artwork with a die to more easily impose art across various sheet sizes (across different documents or within the same document with different artboard sizes).
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Ed commented
Grouping items in Illustrator means it looses all the layer information. While sometimes this is ok, or doesn't matter, it's frustrating at other times - could an option be introduced to 'keep layer information when grouping' (in much the same way that 'paste remember layers' works)?