Hello Ozer Erdem
On your request, I have added option dect() to control the decimal points of standard errors, t-values, or p-value in the nested regressions. I have also fixed the issue with the nofvlabel option. Here is one example where I used the default three decimal places for regression coefficients and two decimal points for standard errors.
sysuse auto, clear
asdocx reg price mpg i.foreign##c.rep78, replace nest
asdocx reg price mpg rep78 headroom, nest
asdocx reg price mpg rep78 headroom weight , nest
asdocx reg price mpg rep78 weight , nest dect(2) nofvlabel
You may like to note that asdocx considers all formatting options of the last command used. You may add these options in each line of code, that does not do any harm though.