Combining aquired items

[Unknow45]

How do I use one item in my inventory on another in the inventory? All I seem to be able to do is take one out and then put it back and pull out anther. I know this sounds really silly and is, but I cant figure it out.

 

Thanks for your help

[Kid]

Just U-se them together

 

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[beezer]

With the PS2 - use the triangle to combine items in your inventory