Add customer payment month wise

[chunu]

Hi,
Need help to add customer payment month wise.

chunu.xlsx
	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q
1	Name	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
2	ABC	200		300			400							customer paid in jan,mar and june
3	LMO
4	New customer here if dose not exist
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6	1. I want to enter data through vba userform
7	2. customers data should be added in the specific month column based textbox date.
8	3.if customer dose not exist create new
9	4. in date textbox if possible just mention month "feb" etc instead of writing full date
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Sheet1