Are you running this in a GUI or CHUI environment? CIM only works in CHUI. As for a Tab key - I'm not sure. When you say escape - do you mean F4. An F4 is a period '.' in a CIM file.
CIM sample
This is probably way mor than you want - but here is a program I had written that updates 5 tables in MFG/PRO. The inout was a supplied spreadsheet, saved in csv format. I hope it helps.
/****************************************************************************/
/*...
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