Canadian Work Experience is defined in the Ministerial Instructions for Express Entry
Verbatim below, but you can see that it requires you to be a foreign national in Canada who has worked for a NOC 0,A,B job and has perfored the actions listed in the lead statement + a substantial number of main duties including all essential duties.
Therefore, if you are a foreign national in Canada, working for a Canadian company in a NOC 0,A,B job, and some part of your NOC duties mentions "occasional travel", you will get points for this. Even if it doesn't, and you can show that you performed all the essential duties + a majority of the main duties, you will get points. There's no requirement for you to be physically present in Canada for every single day of the job. Many jobs will send you for conferences and short business trips.
However, if you are out of Canada for many months continuously, that may not count. It depends on the nature of your job, the company you're working for, and most importantly the NOC statement of duties. If the NOC statement includes something like "may spend long periods on a client's site", you may be ok.
This is general advice, of course the details of your case will matter.
http://gazette.gc.ca/rp-pr/p1/2014/2014-12-01-x10/html/extra10-eng.html#e02
Canadian work experience
(3) For the purposes of this section, Canadian work experience is work experience that
- (a) is acquired by a foreign national in Canada in one or more occupations listed in Skill Type 0 Management Occupations or Skill Level A or B of the National Occupational Classification matrix;
- (b) consists of continuous full-time work experience or the full-time equivalent for part-time work experience; and
- (c) is acquired within the 10-year period preceding the day on which points are assigned to the foreign national under subsection (1).
Requirements
(4) In order to be assigned points under subsection (1) for their Canadian work experience, a foreign national
- (a) must specify in their expression of interest the four-digit code in the National Occupational Classification that corresponds to each of the occupations they have engaged in while accumulating their Canadian work experience; and
- (b) must have performed the actions described in the lead statement for the occupation as set out in the occupational descriptions of the National Occupational Classification, as well as a substantial number of the main duties, including all essential duties, as set out in the National Occupational Classification.
