Sadly no,

Here is your systems specs: ASUS Transformer Book T100TA

Note the Storage listing offers two sizes 32GB eMMC & 64GB eMMC which is what you can buy as separate models.

Now lets dig a little deeper here:

What is eMMC? Here's a writeup that explains what it is: What is eMMC. The key piece of information here is the eMMC is a soldered on module which can't be user replaced as its part of the logic board similar to how Apple's iPad works as a closed system.