String to number / replace "." by nothing

Hello,

i have "sales" as V_String. To use math formulars i need to transform it to a numeric.

First Probem = How to transform the date? when i use select tool and change datatpye to double the 4.310 becomes 4.31 and this is wrong. i guess i need to replace the "." by nothing. but how? i tried the replacefunktion with...

... but i cant select replacement in the "find replace tool" since the row is empty.

second problem = how to use it on the whole data input? i dont want to select a specific row because i have a lot of sales columns.

my table looks like here: