Hi

I'm writing my dissertation and I have a problem.
In my paper I have figures which consist of multiple charts. for example: Figure 1 has four charts 1.A, 1.B, 1.C and 1.D.
All 4 have 1 caption which explains all 4. But when I cross-refer to the figure in the text I can't refer to Figure 1.B for example but only to Figure 1.
And when I add manually the letters they are deleted when I update the manuscript
Is there a way to solve this?

Thanks