How to interact with different object spawned instances

I'm doing a game where there are objects spawning (didn't implement that yet), and when those objects are clicked they go into a grid, which i'm making by taking the image points of a grid sprite i made and assigning the clicked object's position to each corresponding image point.

The problem i'm facing now though is that when I have a grid "filled" by those objects there is gonna spawn another grid instance, of the same grid sprite, where i can keep assigning objects into, however i don't know how to keep creating other instances in relation to the last created so i can make up a grid of grids, in order to get to the second part of the game.

This is a screenshot of what i have so far

Any help is greatly appreciated

'however i don't know how to keep creating other instances in relation to the last created so i can make up a grid of grids, in order to get to the second part of the game.' what ?

Sorry, that was confusing, I mean at the end i'll be making a larger grid that has all those sprites inside of it, including the grid sprites with the clickable objects.

So there'll be grids inside of a larger grid that I want to make by spawning those one beside the other, sry that's confusing me too..

So at the end would be something like this, with each "Grid" containing 9 clickable objects:

Grid | Grid | Grid

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Grid | Grid | Grid

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Grid | Grid | Grid

But I'm not sure how to get each instance of the "Grid"'s to position them in that pattern once they're being spawned one by one.

I could do that, but the clickable objects can vary and won't initially be attached to the grid, they'll be randomly positioned, that's why i'm setting them to go as they're clicked, so that I can assign which ones go in each space of the grid.