Looking for help to filter dropdown values in grid,

[Emeronerp1]

Hi im not good in front end development, i was a winform developer now in learning face.
i want to achieve two things
in inline master detail grid i want to filter the dropdown based on condition
scenario is
i want to add products with unit and tax.
when ever i click product it coming and based on product i want to load unit drop down and based on that unit drop down i want to change the price as well. i made this is details dialog using this.form,productid.changeselect2(args=>{}) , im now stuck how to apply same logic in the grid.

second thing i want to make the grid without caption and to be aligned in center,
precisely in div item list i have blank space for caption

i want to remove this gap and to align in the center of the form.

thanks any help appreciated