Access Input Mask Help

[bonfire00]

I have a serial number field and the first six digits are always the same, so I wanted to create a mask to only enter the last 6 digits and it fill in the first six. However the first six are 400053 and the 0's will not stay 0's, but act as the place holder for the other digits. Is there a way for it to this? I need 400053######

[ranman256]

I would ignore the mask and leave off the 400053.
put the 400053 in a locked text box next to the entry text box.
the user need only enter their #, but the AfterUpdate event would put them together in the fields.

txtField = txtPre & txtEntry

[ssanfu]

I need 400053######

I just made an input mask using
4\0\0\053######;0

The backslash makes the first 3 zeros literal characters that get stored.
See "Input Mask" in help