You will find the following keystrokes useful while entering data:
Tab
Changes to the next data entry field
Shift-Tab
Changes to the next data entry field
Shift+Up/Down/Left or Right Cursor Keys
Marks text
F7
Toggles a marked section of text between underlined and not underlined
F9
Displays the Insert Type Symbol dialog discussed in this section
Ctrl-Enter
Jumps between the source heading and tabulated data sections of the source data entry screen
Ctrl-Down Arrow, Ctrl-Up Arrow
Jumps to the next and previous cards on the tabulated data section