Consolidate data from individual months by summing 2, 3 or more months together

[Kaleo]

Hello,

I need to consolidate monthly targets data for salespersons by summing 2, 3 or more months together.

Details: I have a table with salespersons and their monthly targets, January through December. Sometimes I need to sum data from specific months, for example January+February+March or July+August etc in a new sheet, using a form.
I am too stupid to do this and I will really appreciate any help.

Thank you!

Dummy.xlsm
	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q	R	S	T	U	V	W	X	Y	Z	AA	AB	AC	AD	AE	AF	AG	AH	AI	AJ	AK	AL	AM	AN	AO
1	Region	Sales person	January			February			March			April			May			June			July			August			September			October			November			December			TOTAL 2024
2			Car A	Car B	Car C	Car A	Car B	Car C	Car A	Car B	Car C	Car A	Car B	Car C	Car A	Car B	Car C	Car A	Car B	Car C	Car A	Car B	Car C	Car A	Car B	Car C	Car A	Car B	Car C	Car A	Car B	Car C	Car A	Car B	Car C	Car A	Car B	Car C	Car A	Car B	Car C
3	COMPANY TOTAL		103	100	102	104	99	103	107	101	103	104	104	100	104	101	102	105	100	103	105	103	103	102	107	102	103	102	101	104	100	101	103	103	101	106	100	103	1250	1220	1224
4	Region 1	John	10	12	11	9	10	11	12	12	13	11	14	11	9	11	10	10	10	11	9	12	11	10	12	11	10	12	11	10	12	11	10	12	11	10	12	11	120	141	133
5	Region 1	Mary	12	10	9	12	10	9	12	10	9	12	10	9	12	10	9	12	10	9	12	10	9	12	10	9	12	10	9	12	10	9	12	10	9	12	10	9	144	120	108
6	Region 1	Sam	8	7	8	8	7	8	8	7	8	8	7	8	8	7	8	8	7	8	8	7	8	8	7	8	8	7	8	8	7	8	8	7	8	8	7	8	96	84	96
7	Region 1	Willie	14	12	11	14	12	11	14	12	11	14	12	11	14	12	11	14	12	11	14	12	11	14	12	11	14	12	11	14	12	11	14	12	11	14	12	11	168	144	132
8	REGION 1 TOTAL		44	41	39	43	39	39	46	41	41	45	43	39	43	40	38	44	39	39	43	41	39	44	41	39	44	41	39	44	41	39	44	41	39	44	41	39	528	489	469
9	Region 2	Kevin	9	9	8	10	9	8	9	7	8	9	10	8	10	9	8	11	9	8	12	9	8	10	9	8	11	9	8	10	9	8	9	10	8	11	9	8	121	108	96
10	Region 2	Sandra	10	9	11	11	9	11	12	9	10	10	10	9	10	9	12	10	10	11	10	11	11	10	12	11	10	10	11	10	9	10	10	9	9	10	9	11	123	116	127
11	Region 2	Michael	8	10	12	8	11	12	8	12	12	9	10	12	9	10	12	8	11	12	8	10	13	8	14	12	8	11	12	9	10	12	8	10	13	9	10	12	100	129	146
12	REGION 2 TOTAL		27	28	31	29	29	31	29	28	30	28	30	29	29	28	32	29	30	31	30	30	32	28	35	31	29	30	31	29	28	30	27	29	30	30	28	31	344	353	369
13	Region 3	Dan	11	11	12	11	11	12	11	11	12	11	11	12	11	11	12	11	11	12	11	11	12	11	11	12	11	11	12	11	11	12	11	11	12	11	11	12	132	132	144
14	Region 3	Olivia	9	10	9	9	10	9	9	10	9	9	10	9	9	10	9	9	10	9	9	10	9	9	10	9	9	10	9	9	10	9	9	10	9	9	10	9	108	120	108
15	Region 3	Ava	12	10	11	12	10	12	12	11	11	11	10	11	12	12	11	12	10	12	12	11	11	10	10	11	10	10	10	11	10	11	12	12	11	12	10	12	138	126	134
16	REGION 3 TOTAL		32	31	32	32	31	33	32	32	32	31	31	32	32	33	32	32	31	33	32	32	32	30	31	32	30	31	31	31	31	32	32	33	32	32	31	33	378	378	386
17
18
19		I need a macro that can sum monthly data by my choice (using a form, like in the picture)
20		and put the results in a new sheet (like sheet "Result")
21		Eg:	January+February
22		or	January+February+March
23		or	April+May+June (Q2)
24			etc
Data

Cell Formulas
Range	Formula
C3:AO3	C3	=C8+C12+C16
AM4:AO7,AM9:AO11,AM13:AO15	AM4	=C4+F4+I4+L4+O4+R4+U4+X4+AA4+AD4+AG4+AJ4
C8:AO8	AM8	=SUM(AM4:AM7)
C16:AO16,C12:AO12	AM12	=SUM(AM9:AM11)

Dummy.xlsm
	A	B	C	D	E	F	G	H	I	J	K
1	Region	Sales person	January+February+March
2			Car A	Car B	Car C
3	COMPANY TOTAL		314	300	308
4	Region 1	John	31	34	35
5	Region 1	Mary	36	30	27
6	Region 1	Sam	24	21	24
7	Region 1	Willie	42	36	33
8	REGION 1 TOTAL		133	121	119
9	Region 2	Kevin	28	25	24
10	Region 2	Sandra	33	27	32
11	Region 2	Michael	24	33	36
12	REGION 2 TOTAL		85	85	92
13	Region 2	Dan	33	33	36
14	Region 2	Olivia	27	30	27
15	Region 2	Ava	36	31	34
16	REGION 3 TOTAL		96	94	97
Result

Cell Formulas
Range	Formula
C3:E3	C3	=C8+C12+C16
C8:E8	C8	=SUM(C4:C7)
C12:E12,C16:E16	C12	=SUM(C9:C11)