You can use the Expression area of a step such as "Assign" within a Device Automation step (Desktop Automation step since ver.10.4).
Please refer to the procedure below.
※It explains how to change a single-digit value to a 3-digits one.
1.Create a numerical variable that contains an arbitrary number. (variable name: int)
2.Create a text variable. (variable name: text)
3.Add an Assign step, and set the text variable of step 2 in "Variables".
4.Enter "”00”+text(int)" in "Expression". (activate "=")
If the number of digits of a numerical value stored in an integer variable changes at each process, you can use conditional branching with the formula entered in "Expression", such as in step 4.
＜Example＞Expression to change the number of added 0 depending on the number of digits
※ length()・・・You can count the number of characters.
If the number of characters of a variable is 1 digit: "00" + variable; if 2 digits: "0" + variable; if 3 digits: no 0 padding.