Existing 3D print files in much smaller final printed sizes

I’m going from zero knowledge and experience here, so please bear with me.

I have in mind a project that will need several existing 3D print files to be reduced in size. For example, let’s say that I have a design for a flowery rosette that is 6" in diameter, but I’d like it printed out at 1.25" in diameter. I know I’m going to lose some detail, and that there will be differences in the final print from the existing design file.

I wish I knew how to include an image to show what I have in mind here. Best I can do is to try to include a link to the type of item I will be working with.

I have several other similar items that I’d like to have their final print size reduced.